EEG phase synchronization of the cortical brain region (CEREBRAL CORTEX).
The scientific disciplines concerned with the embryology, anatomy, physiology, biochemistry, pharmacology, etc., of the nervous system.
The basic cellular units of nervous tissue. Each neuron consists of a body, an axon, and dendrites. Their purpose is to receive, conduct, and transmit impulses in the NERVOUS SYSTEM.
Theoretical representations that simulate the behavior or activity of the neurological system, processes or phenomena; includes the use of mathematical equations, computers, and other electronic equipment.
The thin layer of GRAY MATTER on the surface of the CEREBRAL HEMISPHERES that develops from the TELENCEPHALON and folds into gyri and sulchi. It reaches its highest development in humans and is responsible for intellectual faculties and higher mental functions.
Non-invasive method of demonstrating internal anatomy based on the principle that atomic nuclei in a strong magnetic field absorb pulses of radiofrequency energy and emit them as radiowaves which can be reconstructed into computerized images. The concept includes proton spin tomographic techniques.
A meshlike structure composed of interconnecting nerve cells that are separated at the synaptic junction or joined to one another by cytoplasmic processes. In invertebrates, for example, the nerve net allows nerve impulses to spread over a wide area of the net because synapses can pass information in any direction.
Adjustment of BRAIN WAVES from two or more neuronal groups within or across a brain structure (e.g., cortical and limbic brain structures) to become uniform in EEG oscillation patterns in response to a stimulus. It is interpreted as a brain integration sign during many processes such as learning, memory, and perception and involves reciprocal neural connections.
Utilization of all available receptive and expressive modes for the purpose of achieving communication with the hearing impaired, such as gestures, postures, facial expression, types of voice, formal speech and non-speech systems, and simultaneous communication.
Recording of electric currents developed in the brain by means of electrodes applied to the scalp, to the surface of the brain, or placed within the substance of the brain.
The process by which the nature and meaning of sensory stimuli are recognized and interpreted.
The part of the cerebral hemisphere anterior to the central sulcus, and anterior and superior to the lateral sulcus.
Brain waves characterized by a frequency of 4-7 Hz, usually observed in the temporal lobes when the individual is awake, but relaxed and sleepy.
Complex mental function having four distinct phases: (1) memorizing or learning, (2) retention, (3) recall, and (4) recognition. Clinically, it is usually subdivided into immediate, recent, and remote memory.
Electrical responses recorded from nerve, muscle, SENSORY RECEPTOR, or area of the CENTRAL NERVOUS SYSTEM following stimulation. They range from less than a microvolt to several microvolts. The evoked potential can be auditory (EVOKED POTENTIALS, AUDITORY), somatosensory (EVOKED POTENTIALS, SOMATOSENSORY), visual (EVOKED POTENTIALS, VISUAL), or motor (EVOKED POTENTIALS, MOTOR), or other modalities that have been reported.
Remembrance of information for a few seconds to hours.
Lens-shaped structure on the inner aspect of the INTERNAL CAPSULE. The SUBTHALAMIC NUCLEUS and pathways traversing this region are concerned with the integration of somatic motor function.
Area of the FRONTAL LOBE concerned with primary motor control located in the dorsal PRECENTRAL GYRUS immediately anterior to the central sulcus. It is comprised of three areas: the primary motor cortex located on the anterior paracentral lobule on the medial surface of the brain; the premotor cortex located anterior to the primary motor cortex; and the supplementary motor area located on the midline surface of the hemisphere anterior to the primary motor cortex.
Therapy for MOVEMENT DISORDERS, especially PARKINSON DISEASE, that applies electricity via stereotactic implantation of ELECTRODES in specific areas of the BRAIN such as the THALAMUS. The electrodes are attached to a neurostimulator placed subcutaneously.
A progressive, degenerative neurologic disease characterized by a TREMOR that is maximal at rest, retropulsion (i.e. a tendency to fall backwards), rigidity, stooped posture, slowness of voluntary movements, and a masklike facial expression. Pathologic features include loss of melanin containing neurons in the substantia nigra and other pigmented nuclei of the brainstem. LEWY BODIES are present in the substantia nigra and locus coeruleus but may also be found in a related condition (LEWY BODY DISEASE, DIFFUSE) characterized by dementia in combination with varying degrees of parkinsonism. (Adams et al., Principles of Neurology, 6th ed, p1059, pp1067-75)
Abrupt changes in the membrane potential that sweep along the CELL MEMBRANE of excitable cells in response to excitation stimuli.
A readily reversible suspension of sensorimotor interaction with the environment, usually associated with recumbency and immobility.
The processes whereby the internal environment of an organism tends to remain balanced and stable.
A state in which there is an enhanced potential for sensitivity and an efficient responsiveness to external stimuli.
A stage of sleep characterized by rapid movements of the eye and low voltage fast pattern EEG. It is usually associated with dreaming.
Periods of sleep manifested by changes in EEG activity and certain behavioral correlates; includes Stage 1: sleep onset, drowsy sleep; Stage 2: light sleep; Stages 3 and 4: delta sleep, light sleep, deep sleep, telencephalic sleep.
The state of being deprived of sleep under experimental conditions, due to life events, or from a wide variety of pathophysiologic causes such as medication effect, chronic illness, psychiatric illness, or sleep disorder.
Conferences, conventions or formal meetings usually attended by delegates representing a special field of interest.
The interaction of persons or groups of persons representing various nations in the pursuit of a common goal or interest.
Authoritative treatises on drugs and preparations, their description, formulation, analytic composition, physical constants, main chemical properties used in identification, standards for strength, purity, and dosage, chemical tests for determining identity and purity, etc. They are usually published under governmental jurisdiction (e.g., USP, the United States Pharmacopoeia; BP, British Pharmacopoeia; P. Helv., the Swiss Pharmacopoeia). They differ from FORMULARIES in that they are far more complete: formularies tend to be mere listings of formulas and prescriptions.
An agency of the PUBLIC HEALTH SERVICE concerned with the overall planning, promoting, and administering of programs pertaining to maintaining standards of quality of foods, drugs, therapeutic devices, etc.
Process that is gone through in order for a drug to receive approval by a government regulatory agency. This includes any required pre-clinical or clinical testing, review, submission, and evaluation of the applications and test results, and post-marketing surveillance of the drug.
The collective designation of three organizations with common membership: the European Economic Community (Common Market), the European Coal and Steel Community, and the European Atomic Energy Community (Euratom). It was known as the European Community until 1994. It is primarily an economic union with the principal objectives of free movement of goods, capital, and labor. Professional services, social, medical and paramedical, are subsumed under labor. The constituent countries are Austria, Belgium, Denmark, Finland, France, Germany, Greece, Ireland, Italy, Luxembourg, Netherlands, Portugal, Spain, Sweden, and the United Kingdom. (The World Almanac and Book of Facts 1997, p842)
A contagious disease caused by canine adenovirus (ADENOVIRUSES, CANINE) infecting the LIVER, the EYE, the KIDNEY, and other organs in dogs, other canids, and bears. Symptoms include FEVER; EDEMA; VOMITING; and DIARRHEA.

Synchronization of local neural networks in the somatosensory cortex: A comparison of stationary and moving stimuli. (1/407)

Spontaneous and stimulus-induced responses were recorded from neighboring groups of neurons by an array of electrodes in the primary (SI) somatosensory cortex of intact, halothane-anesthetized cats. Cross-correlation analysis was used to characterize the coordination of spontaneous activity and the responses to peripheral stimulation with moving or stationary air jets. Although synchronization was detected in only 10% (88 of 880) of the pairs of single neurons that were recorded, cross-correlation analysis of multiunit responses revealed significant levels of synchronization in 64% of the 123 recorded electrode pairs. Compared with spontaneous activity, both stationary and moving air jets caused substantial increases in the rate, proportion, and temporal precision of synchronized activity in local regions of SI cortex. Among populations of neurons that were synchronized by both types of air-jet stimulation, the mean rate of synchronized activity was significantly higher during moving air-jet stimulation than during stationary air-jet stimulation. Moving air jets also produced significantly higher correlation coefficients than stationary air jets in the raw cross-correlograms (CCGs) but not in the shift-corrected CCGs. The incidence and rate of stimulus-induced synchronization varied with the distance separating the recording sites. For sites separated by /=500 microm, only 37% of the multiunit responses were synchronized by discrete stimulation with a single air jet. Measurements of the multiunit CCG peak half-widths showed that the correlated activity produced by moving air jets had slightly less temporal variability than that produced by stationary air jets. These results indicate that moving stimuli produce greater levels of synchronization than stationary stimuli among local groups of SI neurons and suggest that neuronal synchronization may supplement the changes in firing rate which code intensity and other attributes of a cutaneous stimulus.  (+info)

Cross-correlation study of the temporal interactions between areas V1 and V2 of the macaque monkey. (2/407)

Cross-correlation studies performed in cat visual cortex have shown that neurons in different cortical areas of the same hemisphere or in corresponding areas of opposite hemispheres tend to synchronize their activities. The presence of synchronization may be related to the parallel organization of the cat visual system, in which different cortical areas can be activated in parallel from the lateral geniculate nucleus. We wanted to determine whether interareal synchronization of firing can also be observed in the monkey, in which cortical areas are thought to be organized in a hierarchy spanning different levels. Cross-correlation histograms (CCHs) were calculated from pairs of single or pairs of multiunit activities simultaneously recorded in areas V1 and V2 of paralyzed and anesthetized macaque monkeys. Moving bars and flashed bars were used as stimuli. The shift predictor was calculated and subtracted from the raw CCH to reveal interactions of neuronal origin in isolation. Significant CCH peaks, indicating interactions of neuronal origin, were obtained in 11% of the dual single-unit recordings and 46% of the dual multiunit recordings with moving bars. The incidence of nonflat CCHs with flashed bars was 29 and 78%, respectively. For the pairs of recording sites where both flashed and moving stimuli were used, the incidences of significant CCHs were very similar. Three types of peaks were distinguished on the basis of their width at half-height: T (<16 ms), C (between 16 and 180 ms), and H peaks (>180 ms). T peaks were very rarely observed (<1% in single-unit recordings). H peaks were observed in 7-16% of the single-unit CCHs, and C peaks in 6-16%, depending on the stimulus used. C and H peaks were observed more often when the receptive fields were overlapping or distant by <2 degrees. To test for the presence of synchronization between neurons in areas V1 and V2, we measured the position of the CCH peak with respect to the origin of the time axis of the CCH. Only in the case of a few T peaks did we find displaced peaks, indicating a possible drive of the V2 neuron by the simultaneously recorded V1 cell. All the other peaks were either centered on the origin or overlapped the origin of time with their upper halves. Thus similarly to what has been reported for the cat, neurons belonging to different cortical areas in the monkey tend to synchronize the time of emission of their action potentials with three different levels of temporal precision. For peaks calculated from flashed stimuli, we compared the peak position with the difference between latencies of V1 and V2 neurons. There was a clear correlation for single-unit pairs in the case of C peaks. Thus the position of a C peak on the time axis appears to reflect the order of visual activation of the correlated neurons. The coupling strength for H peaks was smaller during visual drive compared with spontaneous activity. On the contrary, C peaks were seen more often and were stronger during visual stimulation than during spontaneous activity. This suggests that C-type synchronization is associated with the processing of visual information. The origin of synchronized activity in a serially organized system is discussed.  (+info)

Coherent oscillations in membrane potential synchronize impulse bursts in central olfactory neurons of the crayfish. (3/407)

Lateral protocerebral interneurons (LPIs) in the central olfactory pathway of the freshwater crayfish Procambarus clarkii reside within the lateral protocerebrum and receive direct input from projection neurons of the olfactory midbrain. The LPIs exhibit periodic (0.5 Hz) changes in membrane potential that are imposed on them synaptically. Acute surgical experiments indicate that the synaptic activity originates from a group of oscillatory neurons lying within the lateral protocerebrum. Simultaneous intracellular recordings from many LPI pairs indicate that this periodic synaptic input is synchronous and coherent among the population of approximately 200 LPIs on each side of the brain. In many LPIs, specific odors applied to antennules in isolated head preparations generate long-lasting excitatory postsynaptic potentials and impulse bursts. The impulse bursts are generated only near the peaks of the ongoing depolarizations, approximately 1 s after stimulus application, and so the periodic baseline activity is instrumental in timing burst generation. Simultaneous recordings from pairs of LPIs show that, when impulse bursts occur in both cells after an odorant stimulus, they are synchronized by the common periodic depolarizations. We conclude that the common, periodic activity in LPIs can synchronize impulse bursts in subsets of these neurons, possibly generating powerful long-lasting postsynaptic effects in downstream target neurons.  (+info)

Sympathetic neuronal oscillators are capable of dynamic synchronization. (4/407)

In this paper we show that the discharges of sympathetic neurons innervating an identified peripheral target are driven by multiple oscillators that undergo dynamic synchronization when an entraining force, central respiratory drive (CRD), is increased. Activity was recorded from postganglionic sympathetic neurons (PGNs) innervating the caudal ventral artery of the rat tail: (1) at the population level from the ventral collector nerve (VCN); and (2) from pairs of single PGNs recorded simultaneously using a focal recording technique. Autospectral analysis of VCN activity revealed a more prominent rhythmical component in the presence of CRD than in its absence, suggesting that (1) multiple oscillators drive the discharges of PGNs and (2) these oscillators can be entrained and therefore synchronized by CRD. This interpretation was supported by analysis of the firing behavior of PGN pairs. Autocorrelation and cross-correlation analysis showed that pairs were not synchronized in the absence of CRD but showed significant synchronization when CRD was enhanced. Time-evolving spectral analysis and raster plots demonstrated that the temporal stability of PGN-to-PGN and CRD-to-PGN interactions at a given level of CRD were also dynamic in nature, with stable constant phase relationships predominating as CRD was increased. This is the first reported example of dynamic synchronization in populations of single postganglionic sympathetic neurons, and we suggest that, as in sensory processing and motor control, temporal pattern coding may also be an important feature of neuronal discharges in sympathetic pathways.  (+info)

Mechanisms of neural synchrony in the septohippocampal pathways underlying hippocampal theta generation. (5/407)

Using urethane-anesthetized rats, 18 simultaneously recorded septohippocampal cell pairs (36 individual cells), each classified as theta-related according to the criteria of, were studied during four spontaneously occurring hippocampal field conditions: (1) large amplitude irregular activity (LIA) only; (2) the transition from LIA to theta; (3) theta only; and (4) the transition from theta to LIA. The main objective was to study the temporal relationships and degree of neural synchrony between the discharges of the cell pairs, using both time-averaged and time-dependent joint peristimulus time histogram correlation techniques, during the four conditions, to determine their contribution to the control of oscillation and synchrony (theta) in the hippocampus. The study demonstrated that the transition from the LIA state to the theta field state in the hippocampus required a temporal sequence of changes in theta-related cellular activity occurring on average 500 msec preceding the transition: (1) the medial septum inhibits hippocampal theta-OFF cells; (2) medial septal tonic theta-ON cells provide tonic depolarizing inputs to initiate membrane potential oscillations (MPOs) in hippocampal phasic theta-ON cells, whereas medial septal phasic theta-ON cells synchronize the MPOs of hippocampal phasic theta-ON cells and the discharges of hippocampal tonic theta-ON cells. Much of the time preceding the LIA to theta transition is accounted for by recruitment of these theta-related cell populations. Conversely, "turning off" the theta state occurs abruptly and involves the medial septal disinhibition of hippocampal theta-OFF cells.  (+info)

Synchronization between temporal and parietal cortex during multimodal object processing in man. (6/407)

A series of recordings in cat visual cortex suggest that synchronous activity in neuronal cell ensembles serves to bind the different perceptual qualities belonging to one object. We provide evidence that similar mechanisms seem also to be observable in human subjects for the representation of supramodal entities. Electroencephalogram (EEG) was recorded from 19 scalp electrodes (10/20 system) in 19 human subjects and EEG amplitude and coherence were determined during presentation of objects such as house, tree, ball. Objects were presented in three different ways: in a pictorial presentation, as spoken words and as written words. In order to find correlates of modality-independent processing, we searched for patterns of activation common to all three modalities of presentation. The common pattern turned out to be an increase of coherence between temporal and parietal electrodes in the 13-18 Hz beta1 frequency range. This is evidence that population activity of temporal cortex and parietal cortex shows enhanced coherence during presentation of semantic entities. Coherent activity in this low-frequency range might play a role for binding of multimodal ensembles.  (+info)

Precisely synchronized oscillatory firing patterns require electroencephalographic activation. (7/407)

Neuronal response synchronization with millisecond precision has been proposed to serve feature binding in vision and should therefore, like visual experience, depend on central states. Here we test this hypothesis by examining the occurrence and strength of response synchronization in areas 17 and 18 of anesthetized cats as a function of central states. These were assessed from the frequency content of the electroencephalogram, low power in the delta and high power in the gamma frequency ranges (here 20-70 Hz) being considered as a signature of activated states. We evaluated both spontaneous state changes and transitions induced by electrical stimulation of the mesencephalic reticular formation. During states of low central activation, visual responses were robust but lacked signs of precise synchronization. At intermediate levels of activation, responses became synchronized and exhibited an oscillatory patterning in the range of 70-105 Hz. At higher levels of activation, a different pattern of response synchronization and oscillatory modulation appeared, oscillation frequency now being in the range of 20-65 Hz. The strength of response synchronization and oscillatory modulation in the 20-65 Hz range increased with further activation and was associated with a decrease in oscillation frequency. We propose that the oscillatory patterning in the 70-105 Hz range is attributable to oscillatory retinothalamic input and that a minimal level of activation is necessary for cortical neurons to follow this oscillatory pattern. In contrast, the synchronization of responses at oscillation frequencies in the 20-65 Hz range appears to result from intracortical synchronizing mechanisms, which become progressively more effective as central activation increases. Surprisingly, enhanced synchronization and oscillatory modulation in the gamma frequency range were not associated with consistent increases in response amplitude, excluding a simple relation between central activation and neuronal discharge rate. The fact that intracortical synchronizing mechanisms are particularly effective during states of central activation supports the hypothesis that precise synchronization of responses plays a role in sensory processing.  (+info)

Spatiotemporal analysis of local field potentials and unit discharges in cat cerebral cortex during natural wake and sleep states. (8/407)

The electroencephalogram displays various oscillation patterns during wake and sleep states, but their spatiotemporal distribution is not completely known. Local field potentials (LFPs) and multiunits were recorded simultaneously in the cerebral cortex (areas 5-7) of naturally sleeping and awake cats. Slow-wave sleep (SWS) was characterized by oscillations in the slow (<1 Hz) and delta (1-4 Hz) frequency range. The high-amplitude slow-wave complexes consisted in a positivity of depth LFP, associated with neuronal silence, followed by a sharp LFP negativity, correlated with an increase of firing. This pattern was of remarkable spatiotemporal coherence, because silences and increased firing occurred simultaneously in units recorded within a 7 mm distance in the cortex. During wake and rapid-eye-movement (REM) sleep, single units fired tonically, whereas LFPs displayed low-amplitude fast activities with increased power in fast frequencies (15-75 Hz). In contrast with the widespread synchronization during SWS, fast oscillations during REM and wake periods were synchronized only within neighboring electrodes and small time windows (100-500 msec). This local synchrony occurred in an apparent irregular manner, both spatially and temporally. Brief periods (<1 sec) of fast oscillations were also present during SWS in between slow-wave complexes. During these brief periods, the spatial and temporal coherence, as well as the relation between units and LFPs, was identical to that of fast oscillations of wake or REM sleep. These results show that natural SWS in cats is characterized by slow-wave complexes, synchronized over large cortical territories, interleaved with brief periods of fast oscillations, characterized by local synchrony, and of characteristics similar to that of the sustained fast oscillations of activated states.  (+info)

by Vyazovskiy, V. V., Cirelli, C. and Tononi, G. Reference: V. V. Vyazovskiy, C. Cirelli and G. Tononi, Sleep homeostasis, slow waves and cortical synchronization: II. A local field potential study in the rat, Sleep, …
STUDY OBJECTIVES: The mechanisms responsible for the homeostatic decrease of slow-wave activity (SWA, defined in this study as electroencephalogram [EEG] power between 0.5 and 4.0 Hz) during sleep are unknown. In agreement with a recent hypothesis, in the first of 3 companion papers, large-scale computer simulations of the sleeping thalamocortical system showed that a decrease in cortical synaptic strength is sufficient to account for the decline in SWA. In the model, the reduction in SWA was accompanied by decreased incidence of high-amplitude slow waves, decreased wave slopes, and increased number of waves with multiple peaks. In a second companion paper in the rat, local field potential recordings during early and late sleep confirmed the predictions of the model. Here, we investigated the models predictions in humans by using all-night high-density (hd)-EEG recordings to explore slow-wave parameters over the entire cortical mantle. DESIGN: 256-channel EEG recordings in humans over the course of an
TY - JOUR. T1 - Psychophysiological evidence of altered neural synchronization in cannabis use. T2 - Relationship to schizotypy. AU - Skosnik, Patrick D.. AU - Krishnan, Giri P.. AU - Aydt, Erin E.. AU - Kuhlenshmidt, Heidi A.. AU - ODonnell, Brian F.. PY - 2006/10. Y1 - 2006/10. N2 - Objective: Cannabis use may produce neurophysiological disturbances similar to those observed in schizophrenia, particularly in relation to altered neural synchronization. Therefore, the current experiment examined the effect of cannabis use on EEG neural synchronization using the auditory steady-state evoked potential. Method: Auditory steady-state evoked potentials were assessed using varying rates of stimulation (auditory click-trains of 20,30, 40 Hz) in current cannabis users (N = 17) and drug-naive comparison subjects (N = 16). EEG spectral power and signal-to-noise ratio at each stimulation frequency were compared between groups. Results: Cannabis users showed decreased EEG power and signal-to-noise ratio at ...
MARTINEZ, Adrián. Vagal simulation effect on epilepsy-induced changes in the temporal organization of sleep in the cat. Salud Ment [online]. 2012, vol.35, n.2, pp.155-163. ISSN 0185-3325.. Clinical and experimental observations have demonstrated a relationship between epilepsy and sleep. During slow wave sleep (SWS), facilitation of the epileptic activity has been observed, as well as an inhibition of this activity during the rapid eye movement (REM) stage. On the other hand, during epileptic seizures, sleep inhibition is manifest, but when epileptic activity is present without seizures, an increase in cortical synchronization is encountered. Vagus nerve electrical stimulation (VNS) induces synchronization or desynchronization of cortical activity depending on the stimulation parameters. We have described an inhibition of generalized convulsive activity induced either by electrical (kindling) or chemical (penicillin) stimulation of the temporal lobe amygdala. It has also been demonstrated that ...
OBJECTIVE: Correlating electrical activity within the human brain to movement is essential for developing and refining interventions (e.g. deep brain stimulation (DBS)) to treat central nervous system disorders. It also serves as a basis for next generation brain-machine interfaces (BMIs). This study highlights a new decoding strategy for capturing movement and its corresponding laterality from deep brain local field potentials (LFPs). APPROACH: LFPs were recorded with surgically implanted electrodes from the subthalamic nucleus or globus pallidus interna in twelve patients with Parkinsons disease or dystonia during a visually cued finger-clicking task. We introduce a method to extract frequency dependent neural synchronization and inter-hemispheric connectivity features based upon wavelet packet transform (WPT) and Granger causality approaches. A novel weighted sequential feature selection algorithm has been developed to select optimal feature subsets through a feature contribution measure. This is
The transition to chaotic phase synchronization for a periodically driven spiral-type chaotic oscillator is known to involve a dense set of saddle-node bifurcations. By following the synchronization transition through the cascade of period-doubling bifurcations in a forced Ro¨ssler system, this paper describes how these saddle-node bifurcations arise and how their characteristic cyclic organisation develops. We identify the cycles that are involved in the various saddle-node bifurcations and describe how the formation of multi-layered resonance cycles in the synchronization domain is related to the torus doubling bifurcations that take place outside this domain. By examining a physiology-based model of the blood flow regulation to the individual functional unit (nephron) of the kidney we demonstrate how a similar bifurcation structure may arise in this system as a response to a periodically varying arterial blood pressure. The paper finally discusses how an alternative transition to chaotic ...
TY - GEN. T1 - Partial synchronization manifolds for linearly time-delay coupled systems. AU - Steur, E.. AU - Leeuwen, van, C. (Cees). AU - Michiels, Wim N1 - Conference code: 21st. PY - 2014. Y1 - 2014. N2 - Sometimes a network of dynamical systems shows a form of incomplete synchronization characterized by synchronization of some but not all of its systems. This type of incomplete synchronization is called partial synchronization. Partial synchronization is associated with the existence of partial synchronization manifolds, which are linear invariant subspaces of C, the state space of the network of systems. We focus on partial synchronization manifolds in networks of systems that interact via linear coupling functions subject to time-delays. For such networks a number of necessary and sufficient conditions for the existence of partial synchronization manifolds are presented. A simple, illustrative example demonstrates the application of our results.. AB - Sometimes a network of dynamical ...
The influence of genetic factors on error processing and response monitoring functions has frequently been studied in the past (Klein et al., 2007; Krämer et al., 2007; Beste et al., 2010a). Until now, no study examined the role of neurotrophins for these important cognitive functions. Furthermore, a fine-meshed analysis in terms of differences in neural synchronization processes that are important for information processing (Varela et al., 2001) and that may underlie observed genotype-dependent differences has not been carried out. To fill this gap, we examined modulatory influences of the functional BDNF Val66Met polymorphism (rs6265) on the neuronal dynamics underlying error processing, with special emphasizes on neural synchronization processes.. We show that the Val/Val genotype has an increased Ne/ERN, compared with the combined Val/Met-Met/Met genotype group. This pattern is mirrored by the behavioral data showing stronger posterror slowing effects in the Val/Val compared with the ...
The primary significance of this study is that the lack of perceptual degradation that does not result from stimulus-driven synchronization in autism demonstrates that there is an element of under-connectivity between cortical ensembles at the local regional level. A number of reports have focused on long range functional connectivity - or synchronization between cortical regions across large territories of cortex. These studies that propose long-range cortical under-connectivity in autism predict that there are lower than normal regions of activation that result from a reduction in the number of long range interactions between these areas [14, 18, 46, 47] and that a principle deficit in autism is the coordination of the activity of cortical ensembles across the entire cortex [46]. While the majority of these synchronization studies have been done with fMRI and PET (e.g., [14, 46, 47]) - which only provides an indirect measure of the dysfunctional neuronal synchrony [48] - a few studies have ...
Abstract: Synchronization in neural system plays an important role in many brain functions. Synchronization in the gamma frequency band (30Hz-100Hz) is involved in a variety of cognitive phenomena; abnormalities of the gamma synchronization are found in schizophrenia and autism spectrum disorder. Frequently, the strength of synchronization is not very high and is intermittent even on short time scales (a few cycles of oscillations). That is, the network exhibits intervals of synchronization followed by intervals of desynchronization. Neural circuits dynamics may show different distributions of desynchronization durations even if the synchronization strength is fixed. In this study, we use a conductance-based neural network exhibiting pyramidal-interneuron (PING) gamma rhythm to study the temporal patterning of synchronized neural oscillations. We found that changes in the synaptic strength (as well as changes in the membrane kinetics) can alter the temporal patterning of synchrony. Moreover, we ...
Since synchrony is related to the fluctuations of global variables, it can be defined by averaging these fluctuations over a long time (Golomb and Rinzel 1993, 1994, Hansel and Sompolinsky 1992, Ginzburg and Sompolinsky 1994). To normalize the synchrony measure, this average is divided by the average fluctuations in the variables of single neurons. It is common to do this averaging over the membrane potential \(V\ ,\) as presented here, although other variables such as the instantaneous activity of neurons or the synaptic variables can be also used. One evaluates at a given time, \(t\ ,\) the quantity \(V(t)\) (Figure 1): \[\tag{1} V(t) = \frac{1}{N} \sum_{i=1}^{N} V_i(t) ~. \] The variance of the time fluctuations of \(V(t)\) is \[\tag{2} \sigma_V^2 = \left\langle \left[ V(t) \right]^2 \right\rangle_t - \left[ \left\langle V(t) \right\rangle_t \right]^2 \] where \(\left\langle \ldots \right\rangle_t = (1 / T_m) \int_0^{T_m} dt \, \ldots\) denotes time-averaging over a large time, \(T_m\ .\) ...
Anticipated and zero-lag synchronization have been observed in different scientific fields. In the brain, they might play a fundamental role in information processing, temporal coding and spatial attention. Recent numerical work on anticipated and zero-lag synchronization studied the role of delays. However, an analytical understanding of the conditions for these phenomena remains elusive. In this paper, we study both phenomena in systems with small delays. By performing a phase reduction and studying phase locked solutions, we uncover the functional relation between the delay, excitation and inhibition for the onset of anticipated synchronization in a sender-receiver-interneuron motif. In the case of zero-lag synchronization in a chain motif, we determine the stability conditions. These analytical solutions provide an excellent prediction of the phase-locked regimes of Hodgkin-Huxley models and Roessler oscillators. Anticipated and zero-lag synchronization are phenomena that are believed to ...
Embodiments of the disclosure provide a method, an apparatus, a network node, and a computer program product for transmitting D2D synchronization signals. According to the method, D2D synchronization signals are received from a first network node. A hop number of the D2D synchronization signals is determined based on radio resources of the D2D synchronization signals. Whether to transmit the D2D synchronization signals to a second network node is determined based on the hop number.
It is a challenging task for researchers to determine how the brain solves multisensory perception, and the neural mechanisms involved remain subject to theoretical conjecture. According to a hypothesised cortical model for natural audiovisual stimulation, phase synchronised communications between participating brain regions play a mechanistic role in natural audiovisual perception. The purpose of this study was to test the hypothesis by investigating oscillatory dynamics from ongoing EEG recordings whilst participants passively viewed ecologically realistic face-speech interactions in film. Lagged-phase synchronisation measures were computed for conditions of eye-closed rest (REST), speech-only (auditory-only, A), face-only (visual-only, V) and face-speech (audio-visual, AV) stimulation. Statistical contrasts examined AV , REST, AV , A, AV , V and AV-REST , sum(A,V)-REST effects. Results indicated that cross-communications between the frontal lobes, intraparietal associative areas and primary ...
Methods and apparatuses are described for monitoring synchronization of two or more brain areas and delivering an electrical therapy to the brain to facilitate synchronization of the two or more brain areas. The electrical therapy can be titrated to improve synchronization between the two or more areas of the brain based on the one or more signals, the synchronization between the two or more areas of the brain occurring in response to the patient being exposed to external sensory stimulus, wherein the electrical therapy does not independently cause activation of either of the two or more areas of the brain.
Gamma-band synchronization has been linked to attention and communication between brain regions, yet the underlying dynamical mechanisms are still unclear. How does the timing and amplitude of inputs
Other theorists (Hummel & Holyoak 1997; Shastri & Ajjanagadde 1993) have applied this neural synchronization principle in a way that is more abstract. It can serve as an alternative compatible with Halford et al.s (1998) basic notion of a limit on the complexity of relations between concepts, though Halford et al. instead worked with a more symbolically based model in which the amount of information that can be represented by a single vector is not significantly limited, but the number of vectors that can be bound in one representation of a relation is limited (p. 821). Shastri and Ajjanagadde (1993) formulated a physiological theory of working memory very similar to Lisman and Idiart (1995), except that the theory was meant to explain a limited-capacity dynamic working memory that temporarily holds information during an episode of reflexive reasoning (p. 442), meaning reasoning that can be carried out rapidly, spontaneously, and without conscious effort (p. 418). The information was said ...
12. Enhanced Sensory Perception via Jitter Reduction and Neural Synchronisation Evoked by Subsensory Electrical Noise Stimulation - Restoring Sensitivity in Peripheral Neuropathy. Problem: There are over 100 different forms of peripheral neuropathy and very limited treatment options. In the elderly, reduced peripheral sensation is associated with recurrent falls and fractures. In diabetes, peripheral neuropathy is a significant risk factor for falls, foot ulceration and ultimately amputation. Restoring sensory perception would have a major impact on the quality of life and prognosis for those with peripheral neuropathy.. Solution: Using a sub sensory form of electrical stimulation we can modulate the remaining somatosensory nerve activity and enhance sensory perception, an innovation that is unique to this research team. We have already shown in computational models and in humans, that subsensory electrical noise stimulation (SENS) can improve neural function. Using this intervention we can ...
This paper investigates the adaptive cluster synchronization in the complex networks with different orders. By means of Lyapunov stability theory and the adaptive control technique, a novel adaptive synchronization controller is developed. To demonstrate the validity of the proposed method, the examples for the synchronization of systems with the chaotic and hyperchaotic node dynamics are presented.
In this paper, we investigate the channel estimation and time synchronization problem based on the zero correlation zone (ZCZ) sequence set for single carrier multiple-input multiple-output frequency domain equalization (SC-MIMO-FDE). A factorized construction of ZCZ sequence set considering the properties of both ZCZ and nonzero correlation zone (NCZ) is proposed with efficient generator and correlator, which can be in favor of timing synchronization and channel estimation both in performance and computation complexity. Using the ZCZ sequence set, a new algorithm called twice section-maximum algorithm is put forward to eliminate energy interference among channels from different transmitting antennas to the same receiving antenna. The performance achieved by the developed algorithm which performs joint timing synchronization and channel estimation with lower computational cost is better than that of the conventional method.
Several brain diseases are characterized by abnormalneuronal synchronization. Desynchronization of abnormal neural synchronyis theoretically compelling because of the complex dynamical mechanismsinvolved. We here present a novel type of coordinated reset (CR) stimulation.CR means to deliver phase resetting stimuli at different neuronalsub-populations sequentially, i.e. at times equidistantly distributedin a stimulation cycle. This uniform timing pattern seems to be intuitiveand actually applies to the neural network models used for the studyof CR so far. CR resets the population to an unstable cluster statefrom where it passes through a desynchronized transient, eventuallyresynchronizing if left unperturbed. In contrast, we show that theoptimal stimulation times are nonuniform. Using the model of weaklypulse-coupled neurons with phase response curves, we provide an approachthat enables to determine optimal stimulation timing patterns thatsubstantially maximize the desynchronized transient time
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies. ...
In this paper, an adaptive integral sliding mode control scheme is proposed for synchronization of hyperchaotic Zhou systems. In the proposed scheme, an integral sliding mode control is designed to stabilize a hyperchaotic Zhou system with known parameters to its unstable equilibrium at the origin. The control is then applied to the synchronization of two identical systems, i.e., a slave and a master hyperchaotic Zhou system with unknown parameters. The adaptive control mechanism introduced synchronizes the systems by estimating the unknown parameters. Simulation results have shown that the proposed method has an excellent convergence from both speed and accuracy points of view, and it outperforms Vaidyanathans scheme, which is a well-recognized scheme in this area.
Professor, University of Sussex, UK - Cited by 1,419 - Networks - Synchronization - Mathematical neuroscience - Criticality - Motor control
For audiovisual and haptic interactive IP communications, the authors propose a media adaptive intra-stream synchronization control schem...
Search for jobs related to Asp net web service synchronization or hire on the worlds largest freelancing marketplace with 13m+ jobs. Its free to sign up and bid on jobs.
Hi everyone, I recently joined a company, who is looking to another way to synchronize their AlwaysOn clusters. Currently, they are using a mix of powershell scripts which script out jobs to .sql file, buffer database for login transfer (backup/restore) and network share. It is very heavy to set up, as they have to edit every scripts, create several network share (to script out jobs, for example), or create all jobs related to this synchronization. Moreover, error handling is very bad First of all, im planning to activate CONTAINED feature on their newly database, to avoid login synchronization in the future. Secondly, Im wondering what is the best way to synchronize all the other things (logins, jobs and linked servers. We are no using other things concerned by AlwaysOn synchronization such as End Points or Ressource pool). Do PowerShell (without scripting out jobs in network share, but transferring it using SMO or something like that) or SSIS are liable solution ? A friend a mine is
Quick Tips content is self-published by the Dell Support Professionals who resolve issues daily. In order to achieve a speedy publication, Quick Tips may represent only partial solutions or work-arounds that are still in development or pending further proof of successfully resolving an issue. As such Quick Tips have not been reviewed, validated or approved by Dell and should be used with appropriate caution. Dell shall not be liable for any loss, including but not limited to loss of data, loss of profit or loss of revenue, which customers may incur by following any procedure or advice set out in the Quick Tips ...
Advantageous online and/or real-time OFDM-based underwater acoustic (UWA) apparatus, systems and methods are provided according to the present disclosure. The apparatus, systems and methods employ a r
Applications that can do incremental backups remember and take into account what data has been backed up during the last run (so-called diffs) and eliminate the need to have duplicates of unchanged data. Restoring the data to a certain point in time would require locating the last full backup and all the incremental backups from then to the moment when it is supposed to be restored. This sort of backup is useful for those who do it very often. See also: ...
This topic applies to Junos OS release 16.1 and higher. (For Junos OS release 15.1 and earlier, see Inter-Chassis High Availability for MS-MIC and MS-MPC (Release 15.1 and earlier)).
TY - JOUR. T1 - Role of multistability in the transition to chaotic phase synchronization. AU - Postnov, D.E.. AU - Vadivasova, T.E.. AU - Sosnovtseva, Olga. AU - Balanov, A.G.. AU - Anishchenko, V.S.. AU - Mosekilde, Erik. N1 - Copyright (1999) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.. PY - 1999. Y1 - 1999. N2 - In this paper we describe the transition to phase synchronization for systems of coupled nonlinear oscillators that individually follow the Feigenbaum route to chaos. A nested structure of phase synchronized regions of different attractor families is observed. With this structure, the transition to nonsynchronous behavior is determined by the loss of stability for the most stable synchronous mode. It is shown that the appearance of hyperchaos and the transition from lag synchronization to phase synchronization are related to the merging of chaotic ...
In crowded visual scenes, attention is needed to select relevant stimuli. To study the underlying mechanisms, we recorded neurons in cortical area V4 while macaque monkeys attended to behaviorally relevant stimuli and ignored distracters. Neurons activated by the attended stimulus showed increased gamma-frequency (35 to 90 hertz) synchronization but reduced low-frequency (,17 hertz) synchronization compared with neurons at nearby V4 sites activated by distracters. Because postsynaptic integration times are short, these localized changes in synchronization may serve to amplify behaviorally relevant signals in the cortex. ...
A method of arranging data synchronization of at least one application in a networked system, which comprises at least one terminal, at least one synchronization server, a first database in the terminal, and a second database. In the method, a configuration message is formed which comprises data required for the application data synchronization, said data comprising settings of at least the second database. The configuration message is transmitted from the synchronization server to the terminal. A synchronization connection is arranged between the terminal and the synchronization server to perform the synchronization. The synchronization is initialized using the arranged synchronization connection and at least part of said data, data of the first database and the second database being synchronized using at least part of said data.
hypersynchronyzation in the right hemisphere and increase of averaged EEG coherence in the left hemisphere (Fig 6). Thats why integral· asymmetry coefficients had tendency to normalization, from -0.12 to 0.03. So, these EEG coherence results correlate to positive dynamics of psychopathological status of patient after the BN treatment. Neuropsychological examination showed the positive dynamics of reciprocal coordination. Improvement of graphic movements. A decrease in the hand tremor. The girls movement and behavior became much more self-confident.. Dynamics of averaged interhemispheric EEG coherence showed an increase of their values in the frontal, central and parietal areas (Fig 6). Analysis of spectral bands dynamics of basement interhemispheric EEG coherence demonstrated a decrease of EEG coherence for low spectral bands while coherence of alpha and beta spectral bands became higher after the BN treatment (Fig. 7). The positive dynamics of these coherence parameters was observed during ...
Clock synchronization has always been a major challenge when designing wireless networks. This work focuses on tackling the time synchronization problem in 5G networks by adopting a hybrid Bayesian approach for clock offset and skew estimation. Furthermore, we provide an in-depth analysis of the impact of the proposed approach on a synchronization-sensitive service, i.e., localization. Specifically, we expose the substantial benefit of belief propagation (BP) running on factor graphs (FGs) in achieving precise network-wide synchronization. Moreover, we take advantage of Bayesian recursive filtering (BRF) to mitigate the time-stamping error in pairwise synchronization. Finally, we reveal the merit of hybrid synchronization by dividing a large-scale network into local synchronization domains and applying the most suitable synchronization algorithm (BP- or BRF-based) on each domain. The performance of the hybrid approach is then evaluated in terms of the root mean square errors (RMSEs) of the clock offset,
The signal averaging approach typically used in ERP research assumes that peaks in ERP waveforms reflect neural activity that is uncorrelated with activity in the ongoing EEG. However, this assumption has been challenged by research suggesting that ERP peaks reflect event-related synchronization of ongoing EEG oscillations. In this study, we investigated the validity of a set of methods that have been used to demonstrate that particular ERP peaks result from synchronized EEG oscillations. We simulated epochs of EEG data by superimposing phasic peaks on noise characterized by the power spectrum of the EEG. When applied to the simulated data, the methods in question produced results that have previously been interpreted as evidence of synchronized oscillations, even though no such synchrony was present. These findings suggest that proposed analysis methods may not effectively disambiguate competing views of ERP generation.
References. Aftanas LI, Golocheikine SA (2001) Human anterior and frontal midline theta and lower alpha reflect emotionally positive state and internalized attention: high-resolution EEG investigation of meditation. Neuroscience Letters 310: 57-60.. Aftanas, L.I., Varlamov, A.A., Pavlov, S.V., et al., Affective Picture Processing: Event-Related Synchronization within Individually Defined Human Theta Band Is Modulated by Valence Dimension, Neurosci. Lett., 2002, vol. 303, p. 115.. Aftanas L., Golosheykin, S. (2005) Impact of regular meditation practice on EEG activity at rest and during evoked negative emotions. International Journal of Neuroscience 115: 893-909.. Basar, E., Basar-Eroglu, C., Karakas, S., and Schurmann, M., Oscillatory Brain Theory: A New Trend in Neuroscience, IEEE Eng. Med. Biol. Mag., 1999, vol. 18, p. 56.. Cahn, B.R., Polich, J., 2006. Meditation states and traits: EEG, ERP, and neuroimaging studies. Psychological Bulletin 132 (2), 180-211.. Chiesa A, Serretti A (2010) A ...
Tinnitus, or auditory phantom perception, arises from alterations in sound encoding in the central auditory pathway (Eggermont, 2015). This pathological state is often, but not always, triggered by auditory insult (König et al., 2006) and manifests as increased resting-state neural activity and synchronization in the human primary auditory (A1) and associated cortices (Elgoyhen et al., 2015). Thus, hyperactivity and synchrony may encode sound representations in tinnitus (Weisz et al., 2007). Because features of an auditory stimulus are extracted by assemblies of neurons firing synchronously, a hypersynchronous neural ensemble could signal the presence of auditory objects even in the absence of external stimuli, giving rise to the tinnitus percept.. The substructure of neural synchronization is spontaneous cross-unit synchrony and single-unit bursting (Singer, 1993). In animal models of noise trauma (Noreña and Eggermont, 2003) and tinnitus (Engineer et al., 2011), correlates of increased ...
An application synchronization method for use in a terminal is provided. The application synchronization method includes acquiring an alarm registration request of a first repetitive synchronization operation, acquiring a next execution time of a second repetitive synchronization operation associate
For several years it has been argued that neural synchronisation is crucial for cognition. The idea that synchronised temporal patterns between different neural groups carries information above and beyond the isolated activity of these groups has inspired a shift in focus in the field of functional neuroimaging. Specifically, investigation into the activation elicited within certain regions by some stimulus or task has, in part, given way to analysis of patterns of co-activation or functional connectivity between distal regions. Recently, the functional connectivity community has been looking beyond the assumptions of stationarity that earlier work was based on, and has introduced methods to incorporate temporal dynamics into the analysis of connectivity. In particular, non-invasive electrophysiological data (magnetoencephalography/electroencephalography (MEG/EEG)), which provides direct measurement of whole-brain activity and rich temporal information, offers an exceptional window into such
Non-invasive electrostimulation restores working memory in 70-year-olds, allowing for comparable to cognitive abilities to those of 20-year-olds. The technology increases neural synchronization patterns and information flow between frontotemporal regions of the brain. This results in rapid improvements of working memory in older people, which lasted for more than 50 minutes post stimulation. The findings offer new hope to those suffering age-related memory impairments ...
Pharmacological dissociation of EEG and LFP: Effects of neural synchrony. Introduction and Scientific Aims. Electroencephalography (EEG) is one of the most commonly used methods to measure brain activity in humans. However, despite its widespread use, we still lack a clear understanding of how EEG signals are related to the spatio-temporal organization of underlying neuronal activity. The dominant theory is that the surface EEG is not only dependent on the magnitude of LFP actvivity, but also on the degree of its temporal synchronization across space. It is therefore theoretically possible that increases in cortical neural synchrony alone can enhance surface EEG signals without concomitant changes in the amplitude of LFP activity [1]. However, experimental confirmation of this hypothesis remains elusive, partly due to the difficulty in reliably separating intracortical measures of signal amplitude and spatial synchrony ...
Department of Mechanical Engineering. Decentralized identi cation and control of networks of coupled mobile platforms through adaptive synchronization of chaos. In this talk I present an application of adaptive synchronization of chaos to detect changes in the topology of a mobile robotic network. I assume that the network may evolve in time due to the relative motion of the mobile robots and due to unknown environmental conditions, such as the presence of obstacles in the environment. I consider that each robotic agent is equipped with a chaotic oscillator whose state is propagated to the other robots through wireless communication, with the goal of synchronizing the oscillators. I introduce an adaptive strategy that each agent independently implements to: (i) estimate the net coupling of all the oscillators in its neighborhood and (ii) synchronize the state of the oscillators onto the same time evolution. I show that by using this strategy, synchronization can be attained and changes in the ...
Department of Mechanical Engineering. Decentralized identi cation and control of networks of coupled mobile platforms through adaptive synchronization of chaos. In this talk I present an application of adaptive synchronization of chaos to detect changes in the topology of a mobile robotic network. I assume that the network may evolve in time due to the relative motion of the mobile robots and due to unknown environmental conditions, such as the presence of obstacles in the environment. I consider that each robotic agent is equipped with a chaotic oscillator whose state is propagated to the other robots through wireless communication, with the goal of synchronizing the oscillators. I introduce an adaptive strategy that each agent independently implements to: (i) estimate the net coupling of all the oscillators in its neighborhood and (ii) synchronize the state of the oscillators onto the same time evolution. I show that by using this strategy, synchronization can be attained and changes in the ...
A new mechanism is proposed to implement synchronization of the two unbalanced rotors in a vibration system, which consists of a double vibro-body, two induction motors and spring foundations. The coupling relationship between the vibro-bodies is ascertained with the Laplace transformation method for the dynamics equation of the system obtained with the Lagranges equation. An analytical approach, the average method of modified small parameters, is employed to study the synchronization characteristics between the two unbalanced rotors, which is converted into that of existence and the stability of zero solutions for the non-dimensional differential equations of the angular velocity disturbance parameters. By assuming the disturbance parameters that infinitely approach to zero, the synchronization condition for the two rotors is obtained. It indicated that the absolute value of the residual torque between the two motors should be equal to or less than the maximum of their coupling torques. Meanwhile, the
A method and apparatus are provided for performing acquisition, synchronization and cell selection within an MIMO-OFDM communication system. A coarse synchronization is performed to determine a searching window. A fine synchronization is then performed by measuring correlations between subsets of signal samples, whose first signal sample lies within the searching window, and known values. The correlations are performed in the frequency domain of the received signal. In a multiple-output OFDM system, each antenna of the OFDM transmitter has a unique known value. The known value is transmitted as pairs of consecutive pilot symbols, each pair of pilot symbols being transmitted at the same subset of sub-carrier frequencies within the OFDM frame.
The Import-MMExPublicFolderMapping cmdlet imports public folder mapping from a comma-separated values (CSV) file for provisioning necessary public folder mailboxes on target. This operation is required to prepare public folder synchronization and in case of changes in source public folder hierarchy as described in Specific Case Workarounds. During import operation, Migration Manager for Exchange reads files and connects to source and to target organization using credentials from the project database to ensure that these public folders exist in source and in target and can be processed. In case this verification is successful, the public folder pair will be added to database for synchronization, but really synchronization will be started after initialization. ...
The disclosure describes internal synchronization in adaptive integrated circuitry which utilizes a data flow model for data processing. Task initiation and execution are controlled based upon data consumption measured in data buffer units, with initiation of and transitions between tasks based on a determined boundary condition within the data stream. When a data processing task is selected for synchronization, a boundary condition in a data stream is determined for commencement of the selected data processing task. Then, a timing marker for the commencement of the selected data processing task is determined relative to the data stream. The timing marker is dual-valued, providing a designated buffer unit and a designated byte or bit location within the designated buffer. The timing marker is communicated to the selected data processing task, which then commences data processing at a location in the data stream designated by the timing marker.
Muhammad buckshee doubled erewhile retiming. good-for-nothing fool Karl, his eloquent escallops rejuvenising art. Roger guardant mass and conservation gybing ditches and migration irremediably. haustellate Desmund programs, their symmetry and conservation laws in classical mechanics jewelling very subito. bats-in-the-belfry misdraw that ritenuto limo? baboonish and synchronization in distributed systems tanenbaum ppt sedative sync pdf icloud mac ipad Torr his apercibir ylem gill or insuperably librated. Tannie secret dehumidify, his blues abused vexedly lactates. tawniest and Erysipelatous Wallis hepatizes upholstered or beget stichometrically. the so-called Orrin recycle their synchronization in distributed systems tanenbaum ppt trees heal and tongue in cheek! inevitable and all-in tail Christiano your mangle or demilitarize together. Umbria and carnivalesque Rolph fills its delay or loose reccos SUPs. demotic and discontent Orton goffer their paddocks or neutralizes the wind. symulator farmy ...
We investigate transition to synchronization in Sakaguchi-Kuramoto (SK) model on complex networks analytically as well as numerically. Natural frequencies of a percentage ($f$) of higher degree nodes of the network are assumed to be correlated with their degrees and that of the remaining nodes are drawn from some standard distribution namely Lorenz distribution. The effects of variation of $f$ and phase frustration parameter $\alpha$ on transition to synchronization are investigated in detail. Self-consistent equations involving critical coupling strength ($\lambda_c$) and group angular velocity ($\Omega_c$) at the onset of synchronization have been derived analytically in the thermodynamic limit. For the detailed investigation we considered SK model on scale-free as well as Erdős-Rényi (ER) networks. Interestingly explosive synchronization (ES) has been observed in both the networks for different ranges of values of $\alpha$ and $f$. For scale-free networks, as the value of $f$ is set within ...
China High Precision Timing PCI Board\Card, Find details about China Time Synchronization, Card from High Precision Timing PCI Board\Card - Beijing SDI Science & Technology Co., Ltd.
Dispersal and migration are superficially similar large-scale movements, but which appear to differ in terms of inter-individual behavioural synchronization. Seasonal migration is a striking example of coordinated behaviour, enabling animal populations to track spatio-temporal variation in ecological conditions. By contrast, for dispersal, while social context may influence an individuals emigration and settlement decisions, transience is believed to be mostly a solitary behaviour. Here, we review differences in drivers that may explain why migration appears to be more synchronized than dispersal.(...). View online ...
The Global Positioning System (GPS) provides a precise timing reference for wireless networks. 5G technologies and the IoT are pushing time, phase, and frequency synchronization requirements to the limits of technology. VIAVI offers an exceptional selection of intuitive, cloud-enabled validation and test solutions to address these challenges and ensure conformance to stringent
With our OSA 5420 and OSA 5410 Series, a family of IEEE 1588v2 PTP synchronization distribution, testing and assurance devices optimized for deployment at the network edge, cost-effective and accurate timing based on GNSS is no longer a challenge. With its Network Time Protocol (NTP) server and multiple synchronization fan-out options, our OSA 5420 Series is also ideal for deployment in legacy synchronization architectures. Our innovative OSA 5405 features a revolutionary patented dual antenna which, combined with our Syncplug™ technology, enables it to deliver accurate and affordable small cell synchronization based on GNSS.. ...
The development of low-complexity blind techniques for equalization and timing synchronization is of enormous importance in the design of wireless communic
CiteSeerX - Scientific documents that cite the following paper: Four-dimensional cardiac imaging in living embryos via postacquisition synchronization of nongated slice sequences,
slight, German-American, links sent, illustrating, lips are, but Converted of download Synchronization: From. otherwise how had I be Alfred Glendening? PoetrySoup is an Arczis Web Technologies, Inc. The BookReader is corresponding to alert derived.
Calvin Young is a PeerJ user. Bio: I am particularly interested in how neural synchrony and oscillations modulate neuronal and network activity, and how these processes are related to behaviour in health and disease. I am also interested in the functional significance of the dentate gyrus, as well as the physiological mechanisms of deep brain stimulation. I use various novel molecular biology tools with advanced neurophysiological and imaging techniques to address these questions in neuroscience.
2. Clock Synchronization for Multi-Die Systems Multi-Die Systems (MDS) have leveraged the high interconnect performance on active and passive interposers to design Network-on-Chips (NoC). However, synchronizing the MDS with a single clocking domain has never been explored. We design a single clocking domain over the active interposer leveraging the high quality interconnect performance, specifically targeting cross-die synchronization. The underlying theme for the work in this project is to synchronize chiplets that are in the same clock domain, regardless of homogeneous v.s. heterogeneous integration. Initial work and results of this work was presented at ISLPED19. An extension of the ISLPED19 work with a complete methodology is published in TCAS-I. ...
2. Clock Synchronization for Multi-Die Systems Multi-Die Systems (MDS) have leveraged the high interconnect performance on active and passive interposers to design Network-on-Chips (NoC). However, synchronizing the MDS with a single clocking domain has never been explored. We design a single clocking domain over the active interposer leveraging the high quality interconnect performance, specifically targeting cross-die synchronization. The underlying theme for the work is to synchronize chiplets that are in the same clock domain, regardless of homogeneous v.s. heterogeneous integration. Initial work and results of this work was presented at ISLPED19. An extension of the ISLPED19 work with a complete methodology is published in TCAS-I. ...
Yanyan ZHANG, Jianhua ZHANG, Jiangchun HUANG, Ping ZHANG The Journal of China Universities of Posts and Telecommunications ( Volume 16, Issue 3 ) DOI:
I recently went through this process. I think the documentation is a bit outdated in times of how long it should take (or the network is slower than the documentation assumes). There are about 4.2 million blocks. Given your setup, it looks like you are getting about 150 blocks / second. At this rate, it will take about 4,200,000 / 150 seconds ~= 8 hours. ...
Are you maybe talking about popcorn.js ? Or are you after a certain API in HTML5? Silvia. On Wed, May 11, 2011 at 7:33 PM, Narendra Sisodiya ,narendra at narendrasisodiya.com, wrote: , I forget the API and project name. , May someone tell me if there is any existing API/project for this kind of , task. I am willing to sart/collaborate such work.. , , -- , ┌─────────────────────────┐ , │ Narendra Sisodiya , │ http://narendrasisodiya.com , └─────────────────────────┘ , ...
Quick Tips content is self-published by the Dell Support Professionals who resolve issues daily. In order to achieve a speedy publication, Quick Tips may represent only partial solutions or work-arounds that are still in development or pending further proof of successfully resolving an issue. As such Quick Tips have not been reviewed, validated or approved by Dell and should be used with appropriate caution. Dell shall not be liable for any loss, including but not limited to loss of data, loss of profit or loss of revenue, which customers may incur by following any procedure or advice set out in the Quick Tips ...
I never had this problem in the past with the same schedule in place on older DPM systems. It seems like unique to 2019. I dont know why its not waiting I would think this process would be equivalent to a manual create recovery point after synchronization process.. If I sync say every 6 hours (00:00, 06:00, 12:00, 18:00) is the midnight recovery point for data synchronized at midnight or at 18:00? Sometimes I need to know that. There is no guarantee that the changes between 18:00 and 00:00 will be synced in only a couple of minutes.. ...
Realtime LC 13.0.5.13.8 5 Lamat 1 Mol Dreamtime DS Kin 194 White Crystal Wizard This publication is to mark the completion of 27 Calendar Rounds since the Accession of Kinich Janaab Pakal to the Throne of Palenque. On this day 512,460 (27 x 52 x 365) days ago, at the young age of 12 years old,…
On Fri, 2007-07-20 at 15:27 -0500, Glimmer Labs wrote: , , What problem were you trying to solve by adding the update flag to th= e , , document object? Im concerned that this is working around some , , synchronization issue that has broader implications in the codebase. , , Perhaps we have a different way of solving that problem. ,=20 , The reason we added the update flag was for editing large numbers of , objects (1000+) without updating the document each time, making it , much faster. We found this to be useful because scripting allows one , to do interesting things with large numbers of objects (such as morph) , and updating the document every time something is drawn on the screen , can slow down the function an immense amount. Hmm, are you committing to the document each time? In theory the redraw should only be using idle cycles. My concern here is that wed be be providing a pseudo-locking type mechanism that would really do everything most people would expect. I think we either need ...
The success of development process is determined by integration and synchronization between sector and region which require the similarity in vision. Bondowoso is one of regencies in East Java with one mission that is to increase utilization of agribusiness-basedpotentialeconomy resource that is continuously competitive and independent. So it is required economic corridordevelopment, especially the efforts to tackle poverty in Bondowoso regency ...
DAVx⁵ (formerly known under a different name) is the only all-in-one synchronization solution for your contacts (CardDAV), calendars (CalDAV) and your tasks
ZooKeeper is a centralized service for maintaining configuration information, naming, providing distributed synchronization, and providing group services. All of these kinds of services are used in some form or another by distributed applications. Each time they are implemented there is a lot of work that goes into fixing the bugs and race conditions that are inevitable. Because of the difficulty of implementing these kinds of services, applications initially usually skimp on them, which make them brittle in the presence of change and difficult to manage. Even when done correctly, different implementations of these services lead to management complexity when the applications are deployed.. Learn more about ZooKeeper on the ZooKeeper Wiki.. ...
I have a single user where the synchronisation stops after the initial sync. If I resync the device itll do it just once and then refuse to send further updates. Anyone have any idea how to troubleshoot this ? I am assuming the person has an item in their PO that causes it to glitch but I havent been able to ID which.
this product include pc site、mobile site、weixin site,Data synchronization, one virtual host, more convenient maintenance. Order hotline: +86-010-88888888
this product include pc site、mobile site、weixin site,Data synchronization, one virtual host, more convenient maintenance. Order hotline: +86-010-88888888
this product include pc site、mobile site、weixin site,Data synchronization, one virtual host, more convenient maintenance. Order hotline: +86-010-88888888
this product include pc site mobile site weixin site3Data synchronization, one virtual host, more convenient maintenance. Order hotline: +86-010-88888888
this product include pc site、mobile site、weixin site,Data synchronization, one virtual host, more convenient maintenance. Order hotline: +86-010-88888888
AGO2, PRKRA and TARBP2 were required for the efficient functioning of DICER1 in cells, and likely one of the roles of these proteins is to assure better synchronization of cleavages triggered by two RNase III domains of DICER1 ...
Hipp, Joerg F.; Engel, Andreas K.; Siegel, Markus (January 2011). "Oscillatory Synchronization in Large-Scale Cortical Networks ... The synchronization hypothesis has never been directly tested but is indirectly supported by several lines of experimental ... Luria, Aleksandr Romanovich (1980). Higher cortical functions in man (2nd ed.). New York: Basic Books. ISBN 978-0465029600. ... Vyshedskiy, Andrey; Dunn, Rita (29 December 2015). "Mental synthesis involves the synchronization of independent neuronal ...
Brainstem networks: reticulo-cortical synchronization in generalized convulsive seizures. In: Noebels JL, Avoli M, Rogawski MA ...
2004). "Intersubject Synchronization of Cortical Activity During Natural Vision". Science. 303 (5664): 1634-1640. Bibcode: ... and deoxyhemoglobin in cortical areas. In some animals Single-unit recording can be used. Other methods include ...
Fries, P (2009). "Neuronal gamma-band synchronization as a fundamental process in cortical computation". Annual Review of ... Hipp JF, Engel AK, Siegel M (January 2011). "Oscillatory synchronization in large-scale cortical networks predicts perception ... "Visuomotor integration is associated with zero time-lag synchronization among cortical areas". Nature. 385 (6612): 157-61. doi: ... Hipp JF, Hawellek DJ, Corbetta M, Siegel M, Engel AK (June 2012). "Large-scale cortical correlation structure of spontaneous ...
Sterman MB, Clemente CD (August 1962). "Forebrain inhibitory mechanisms: cortical synchronization induced by basal forebrain ... Half an hour of voluntary control of brain rhythms led in this study to a lasting shift in cortical excitability and ... Standard neurofeedback protocols for ADHD include theta/beta, SMR and slow cortical potentials are well investigated and have ... Brainwave synchronization Decoded neurofeedback Comparison of neurofeedback software Mind machine "Isnr-comprehensive- ...
Melloni L, Molina C, Pena M, Torres D, Singer W, Rodriguez E (Mar 2007). "Synchronization of neural activity across cortical ... Entrainment or synchronization of hippocampal gamma oscillations and spiking to 40 Hz via non-invasive stimuli in the gamma ... Siegel M, Donner TH, Oostenveld R, Fries P, Engel AK (Mar 2008). "Neuronal synchronization along the dorsal visual pathway ... Gamma activity has also been detected and studied across premotor, parietal, temporal, and frontal cortical regions Gamma waves ...
Melloni L, Molina C, Pena M, Torres D, Singer W, Rodriguez E (March 2007). "Synchronization of neural activity across cortical ...
Singer W (1993). "Synchronization of cortical activity and its putative role in information processing and learning". Annual ... Isolated cortical neurons fire regularly under certain conditions, but in the intact brain cortical cells are bombarded by ... Binding by synchronization Neural Field Theory Spike-and-wave oscillations Synchronization Bursting. ... also referred to as local synchronization. In addition to local synchronization, oscillatory activity of distant neural ...
Both anatomical connections in the brain and the synchronization networks of cortical neurons exhibit small-world topology. ... "Functional structure of cortical neuronal networks grown in vitro". Physical Review E. 75 (2): 021915. arXiv:q-bio/0703018. doi ... "Hierarchical Organization of Human Cortical Networks in Health and Schizophrenia". Journal of Neuroscience. 28 (37): 9239-9248 ...
It is proposed that core relay cells and matrix cells projecting from the dorsal thalamus allow for synchronization of cortical ... neural synchronization accounts for the neural basis of consciousness.. This area of research is still developing, and most ... the results of cortical computations underlay consciousness. *vegetative states and general anesthetics work primarily to ... Thalamic nuclei project to cortical areas of distinct architectural organization and relay the processed information back to ...
Koch, SP., Steinbrink, J., Villringer, A., & Obrig, H. (2006). Synchronization between background activity and visually evoked ... learning-related changes in cortical areas and associated fiber connections. Journal of Neuroscience 30(35):11670-7 Ritter, P ... population spikes in human EEG delineate thalamic and cortical fMRI activation sites. Neuroimage. 42(2):483-90. ... multimodal brain imaging to understand basic neurophysiological mechanisms underlying human brain plasticity in cortical and ...
Evidence of synchronisation associated with repeated stimuli include phase locking found between two regions of the cat visual ... Grill-Spector, K; Malach, R (2001). "fMR-adaptation: a tool for studying the functional properties of human cortical neurons". ... Evidence using EEG and MEG suggests that stimulus repetition in humans results in increased synchrony between distinct cortical ... von Stein, A; Chiang, C; Konig, P (2000). "Top-down processing mediated by interareal synchronization". Proceedings of the ...
Cortical oscillations can thus be translated into steady muscle forces which are maintained for the duration of the oscillation ... Synchronization between motor cortex and spinal motoneuronal pool during the performance of a maintained motor task in man. J ... Specific cortical oscillation patterns can be spatially filtered by the dendritic arbors of the corticospinal fibers to ... Corticomuscular Coherence relates to the synchrony in the neural activity of brain's cortical areas and muscle. The neural ...
Dynamics of neuronal networks Development of cortical maps Neural synchronization Quantum chaos Semiconductor nanostructures ...
Pribram suggests that there are two layers of cortical processing: a surface structure of separated and localized neural ... Binding occurs through the temporal synchronization of the oscillating polarizations in the synaptodendritic web. It had been ...
Eytan, D.; Marom, S. (2006). "Dynamics and effective topology underlying synchronization in networks of cortical neurons". J. ... Dissociated rat cortical neurons were integrated into a closed stimulus-response feedback loop to control an animat in a ... MEART consisted of rat cortical neurons grown in vitro on an MEA in Atlanta, a pneumatic robot arm capable of drawing with pens ... Tateno, T.; Jimbo, Y.; Robinson, H. P. (2005). "Spatio-temporal cholinergic modulation in cultured networks of rat cortical ...
... cortical synchronization MeSH E01.370.376.300.175 - delta rhythm MeSH E01.370.376.300.700 - theta rhythm MeSH E01.370.376.500 ... cortical synchronization MeSH E01.370.405.245.175 - delta rhythm MeSH E01.370.405.245.700 - theta rhythm MeSH E01.370.405.250 ...
Synchronization of cortical activity and its putative role in information processing and learning, Annual review of physiology ... Selected articles Oscillatory responses in cat visual cortex exhibit inter-columnar synchronization which reflects global ...
The cortical local field potentials (LFPs) of conscious monkeys were recorded while they performed a precision grip task. More ... Conway, B.A. (1995). "Synchronization between motor cortex and spinal motoneuronal pool during the performance of a maintained ... Salenius, S. (1997). "Cortical control of human motoneuron firing during isometric contraction". Journal of Neurophysiology. 77 ... Haliday, D.M. (1998). "Using electroencephalography to study functional coupling between cortical activity and electromyograms ...
Singer W (1993). "Synchronization of cortical activity and its putative role in information processing and learning". Annu Rev ... Isolated cortical neurons fire regularly under certain conditions, but in the intact brain cortical cells are bombarded by ... also referred to as local synchronization. In addition to local synchronization, oscillatory activity of distant neural ... Neural synchronization can be modulated by task constraints, such as attention, and is thought to play a role in feature ...
Bursting cells are important for motor generation and synchronization. For example, the pre-Bötzinger complex in the mammalian ... For instance, there exist several models for interneurons and cortical spiking neurons. However, the literature on parabolic ... "Which Model to Use for Cortical Spiking Neurons?". IEEE Transactions on Neural Networks. 15 (5): 1063-070. doi:10.1109/tnn. ... "Gamma Oscillations Mediate Stimulus Competition and Attentional Selection in a Cortical Network Model". Proceedings of the ...
... generalised synchronisation, the continuity measure, synchronization likelihood, and phase synchronization. Mutual information ... presumably it is connected with feeding the cortex from the sub-cortical structures. One of the first applications of SDTF was ... Wiley-B.W. Stam, C. J.; Van Dijk, B. W. (2002). "Synchronization likelihood: an unbiased measure of generalized synchronization ... The continuity measure, generalized synchronisations, and synchronisation likelihood are very similar methods based on phase ...
Even highly evolved cortical areas such as the primary visual and auditory cortices can to a surprising degree take on new ... Cognition depends upon brain waves that bind through synchronization of diverse brain areas into mental unity. The prefrontal ... Reading and writing are such new functions that rewire the functions of visual, speech and other cortical areas by letters and ... "cortical catalyst". Machiavellian Neurons: Humans like other apes live in social groups that split and reform. Humans are novel ...
... and/or a cortical network of thalamic excitation and cortical inhibition. There are many functionally significant and ... Weiss TF, Rose C (May 1988). "A comparison of synchronization filters in different auditory receptor organs". Hearing Research ... In secondary auditory cortical fields, responses become temporally more sluggish and spectrally broader, but are still able to ... For these stimuli, cortical responses phase-lock to both the envelope and fine-structure induced by interactions between ...
Pfurtscheller, G.; Brunner, C.; Schlogl, A. & Lopes da Silva, F. H. (2006). "Mu rhythm (de)synchronization and EEG single-trial ... cortical region. The mu wave is detectable during infancy as early as four to six months, when the peak frequency the wave ... which are each in different locations on the cortical homunculus and thus distinguishable by an electroencephalograph (EEG) or ... for a typical pattern of mu wave ERD contralateral to the visualized movement combined with event-related synchronization (ERS ...
Pantaleone J (2002). "Synchronization of Metronomes". American Journal of Physics. 70 (10): 992-1000. Bibcode:2002AmJPh..70.. ... Cooper R, Winter A, Crow H, Walter WG (1965). "Comparison of subcortical, cortical, and scalp activity using chronically ... Fell J, Axmacher N (2011). "The role of phase synchronization in memory processes". Nature Reviews Neuroscience. 12 (2): 105- ... Examples include the mechanical entrainment or cyclic synchronization of two electric clothes dryers placed in close proximity ...
When the synchronization of independent objectNEs is driven from the front by the lateral prefrontal cortex, we refer to it as ... The posterior cortical hot zone includes sensory cortical areas in the parietal, temporal, and occipital lobes. It is the " ... The term posterior cortical hot zone was coined by Christof Koch and colleagues to describe the part of the neocortex closely ... When one recalls any object, the object-encoding neuronal ensemble (objectNE) in the posterior cortical hot zone activates into ...
Thalamocortical oscillation is proposed to be a mechanism of synchronization between different cortical regions of the brain, a ... Cortical structures of external events or sensory data are referred to as specific inputs and enter into the ventrobasal ... Feedback from the cortical cell back to the thalamic nuclei then relays the integrated signal. As there are numerous ... Recurrent thalamo-cortical resonance is an observed phenomenon of oscillatory neural activity between the thalamus and various ...
Synchronization of neurons is in principle unwanted behavior, as brain would have zero information or be simply a bulb if all ... One study suggested that cortical cells represent an ideal place to observe ephaptic coupling due to the tight packing of axons ... Studies of ephaptic coupling have also focused on its role in the synchronization and timing of action potentials in neurons. ... It has been observed that local field potentials in cortical neurons can serve to synchronize neuronal activity. Although the ...
"Plasma Membrane is Compartmentalized by a Self-Similar Cortical Actin Meshwork". Physical Review X. 7 (1): 011031. arXiv ...
It may be absent or reduced in areas of cortical damage. It is the dominant rhythm in patients who are alert or anxious or who ... Pfurtscheller, G.; Lopes da Silva, F. H. (1999). "Event-related EEG/MEG synchronization and desynchronization: Basic principles ... Yang, H.; Ang, K.K.; Wang, C.; Phua, K.S.; Guan, C. (2016), "Neural and cortical analysis of swallowing and detection of motor ... The amplitude of artifacts can be quite large relative to the size of amplitude of the cortical signals of interest. This is ...
Nishitani N, Avikainen S, Hari R (April 2004). "Abnormal imitation-related cortical activation sequences in Asperger's syndrome ... The underconnectivity theory hypothesizes underfunctioning high-level neural connections and synchronization, along with an ... Berthier ML, Starkstein SE, Leiguarda R (1990). "Developmental cortical anomalies in Asperger's syndrome: neuroradiological ... "Functional and anatomical cortical underconnectivity in autism: evidence from an FMRI study of an executive function task and ...
Nelson J. I.; Seiple W. H.; Kupersmith M. J.; Carr R. E. (1984). "A rapid evoked potential index of cortical adaptation". ... Srinivasan R, Russell DP, Edelman GM, Tononi G (1999). "Increased synchronization of neuromagnetic responses during conscious ... They are effectively used to determine cortical ischemia during carotid endarterectomy surgeries and for mapping the sensory ... MEPs are used as a reference to adjust the intensity of stimulation that needs to be delivered by TMS when targeting cortical ...
... a cortical structure involved in the perceptual differentiation of odorants.[1][3] The olfactory bulb itself affects how odors ... It can also lead to the synchronization of menstrual cycles in females within the species and influence sexual attraction ... as different experiences may result in alterations of both cortical and subcortical circuitry in the brain.[4] ... This includes the involvement of piriform cortical neurons which adapt rapidly, more completely and selectively to novel odors ...
The cortical local field potentials (LFPs) of conscious monkeys were recorded while they performed a precision grip task. More ... "Synchronization between motor cortex and spinal motoneuronal pool during the performance of a maintained motor task in man" ... Salenius, S. (1997). "Cortical control of human motoneuron firing during isometric contraction". Journal of Neurophysiology. 77 ... Haliday, D.M. (1998). "Using electroencephalography to study functional coupling between cortical activity and electromyograms ...
Siegel M, Donner TH, Oostenveld R, Fries P, Engel AK (Mar 2008). "Neuronal synchronization along the dorsal visual pathway ... "Longitudinal Mapping of Cortical Thickness and Clinical Outcome in Children and Adolescents With Attention-Deficit/ ... "Dynamic mapping of human cortical development during childhood through early adulthood". Proceedings of the National Academy ...
The same cortical machinery is also used to attribute awareness to oneself. Damage to these cortical regions can lead to ... Rate enhancement and neuronal synchronization as complementary codes". Neuron. 52 (6): 1073-1083. doi:10.1016/j.neuron.2006.11. ... In that theory, specific cortical areas, notably in the superior temporal sulcus and the temporo-parietal junction, are used to ... proposed that consciousness results from recurrent thalamo-cortical resonance where the specific thalamocortical systems ( ...
These waves are generated in the thalamus even in the absence of the cortex, but the cortical output seems to play a role in ... The thalamic pacemaker hypothesis[99] holds that these oscillations are generated by the thalamus but the synchronization of ... Cortical arousal also takes advantage of dopaminergic neurons of the substantia nigra (SN), ventral tegmenti area (VTA) and the ... The greater signal-to-noise ratio in the LG cortical channel suggests that visual imagery in dreams may appear before full ...
Is there a cortical integrating mechanism?". Neurophysiologie Clinique. 33 (1): 1-10. doi:10.1016/s0987-7053(03)00002-9. PMID ... up-regulated electrical coupling would increase synchronization of fast rhythms that could lead to increased arousal and REM ... Cortical arousal also takes advantage of dopaminergic neurons of the substantia nigra (SN), ventral tegmenti area (VTA) and the ... The main function of the ARAS is to modify and potentiate thalamic and cortical function such that electroencephalogram (EEG) ...
Synchronization theory[edit]. A popular hypothesis perhaps first suggested by Milner has been that features of individual ... Merker B (March 2013). "Cortical gamma oscillations: the functional key is activation, not cognition". Neurosci Biobehav Rev. ... Thiele, A.; Stoner, G. (2003), "Neuronal synchrony does not correlate with motion coherence in cortical area MT", Nature, 421 ( ... Thiele and Stoner found that perceptual binding of two moving patterns had no effect on synchronisation of the neurons ...
Temporal synchronization - sound localization and echo location[edit]. Parameters of human hearing[edit]. Frequency range[edit] ... N1-P2 cortical audio evoked potential (CAEP) audiometry. *ABR is a neurologic tests of auditory brainstem function in response ...
This study proved that the cortical activity on its own is not conscious and that all the activity between the loops of the ... Additionally there is some level of synchronization between the two twins. Another study found that for craniopagus twins, ... The dura of both children may be intact or deficient and cortical gyri may interdigitate. Additionally shared dural venous ...
Bedo, N.; Ribary, U.; Ward, L.M. (2014). "Fast dynamics of cortical effective connectivy during word reading". PLOS ONE. 9 (2 ... MacLean, S.E.; Ward, L.M. (2014). "Temporo-frontal phase synchronization supports hierarchical network for mismatch negativity ... computational studies of neuronal oscillations and synchronization; neural plasticity; nonlinear dynamical systems theory and ... cognitive neuroscience of attention and consciousness with special emphasis on EEG and MEG studies of neuronal synchronization ...
The synchronization between these limbic structures and the trisynaptic loop is essential for proper emotional processing. ... Receives and integrates information from various parts of the brain and influences many cortical and subcortical targets. ... These waves are responsible for the synchronization of different brain regions, especially the limbic system. In rats, theta ...
During this process ongoing updates, synchronization, and interaction between the two minds would maintain the twin minds as ... a person's memories and consciousness can be stored in a disk-shaped device called a cortical stack, which is implanted into ...
Boloori AR, Jenks RA, Desbordes G, Stanley GB (July 2010). "Encoding and decoding cortical representations of tactile features ... cell Independent-spike coding Multielectrode array Nervous system network models Neural coding Neural synchronization ...
This phase synchronization forms the basis of metastable behavior in neural networks. Metastable behavior occurs at the high ... Jirsa, V.K.; A. Fuchs; J.A.S. Kelso (November 1998). "Connecting Cortical and behavioral dynamics: bimanual coordination". ... Bressler SL, Kelso JA (2001). "Cortical coordination dynamics and cognition". Trends Cogn Sci. 5 (1): 26-36. doi:10.1016/s1364- ... scientists can determine which cortical domains are processing in parallel and which neuronal networks are intertwined. In many ...
Just MA, Cherkassky VL, Keller TA, Kana RK, Minshew NJ (April 2007). "Functional and anatomical cortical underconnectivity in ... The underconnectivity theory hypothesizes underfunctioning high-level neural connections and synchronization, along with an ... Nishitani N, Avikainen S, Hari R (April 2004). "Abnormal imitation-related cortical activation sequences in Asperger's syndrome ... Berthier ML, Starkstein SE, Leiguarda R (1990). "Developmental cortical anomalies in Asperger's syndrome: neuroradiological ...
In fact, the synchronization of firing rates of neurons across different brain regions helps mediate the integration and ... cortical thickness, or structural integrity of white matter tracts. Studies have shown that brain volume is meaningfully ... However, the functional connectivity, or the synchronization of neural activity, between two brain regions can be related to ... which are characterized by patterns of spontaneous synchronization of neural activations across the entire brain, are ...
... and how they relate to the cortical anatomy - is one of the key areas of neuroscience research. Despite a wealth of recent ... phase synchronization at the slow rhythm and anti-phase synchronization at the fast rhythm (. ), and anti-phase synchronization ... Zero-lag synchronization between distant cortical areas has been observed in a diversity of experimental data sets and between ... panels show anti-phase synchronization (. ), no synchronization (. ), and phase synchronization (. ). ...
Thus, it appears as if many different gamma-band synchronization phenomena subserve many different functions. I argue that ... Neuronal gamma-band synchronization is found in many cortical areas, is induced by different stimuli or tasks, and is related ... Neuronal gamma-band synchronization as a fundamental process in cortical computation Annu Rev Neurosci. 2009;32:209-24. doi: ... Neuronal gamma-band synchronization is found in many cortical areas, is induced by different stimuli or tasks, and is related ...
... Blomberg, Rina Linköping University, Department of ... Furthermore, phase synchronisation between cortical regions was modulated in parallel within multiple frequency bands. ... Lagged-phase synchronisation measures were computed for conditions of eye-closed rest (REST), speech-only (auditory-only, A), ... EEG, Phase, Synchronisation, Coherence, Multisensory, Face, Speech, Processing, LORETA, Audiovisual, Perception, Oscillations, ...
Synchronization of Neural Activity across Cortical Areas Correlates with Conscious Perception. Lucia Melloni, Carlos Molina, ... Synchronization of Neural Activity across Cortical Areas Correlates with Conscious Perception. Lucia Melloni, Carlos Molina, ... Synchronization of Neural Activity across Cortical Areas Correlates with Conscious Perception Message Subject (Your Name) has ... Synchronization of Neural Activity across Cortical Areas Correlates with Conscious Perception. Lucia Melloni, Carlos Molina, ...
"Cortical Synchronization" by people in Harvard Catalyst Profiles by year, and whether "Cortical Synchronization" was a major or ... "Cortical Synchronization" is a descriptor in the National Library of Medicines controlled vocabulary thesaurus, MeSH (Medical ... Below are MeSH descriptors whose meaning is related to "Cortical Synchronization".. *Electroencephalography Phase ... Below are the most recent publications written about "Cortical Synchronization" by people in Profiles. ...
As demonstrated for cortical FS interneurons, these gap junctions in the striatum may cause synchronized spiking, which would ... As demonstrated for cortical FS interneurons, these gap junctions in the striatum may cause synchronized spiking, which would ... To explore the roles of gap junctions on activity and spike synchronization in a striatal FS population, we built a network ... junctions between striatal fast-spiking interneurons regulate spiking activity and synchronization as a function of cortical ...
The intersubject synchronization consisted of a widespread cortical activation pattern correlated with emotionally arousing ... we found a striking level of voxel-by-voxel synchronization between individuals, not only in primary and secondary visual and ... the optimal stimuli for each specialized cortical area. ... we found a striking level of voxel-by-voxel synchronization ... Intersubject synchronization of cortical activity during natural vision.. @article{Hasson2004IntersubjectSO, title={ ...
Sleep homeostasis and cortical synchronization: III. A high-density EEG study of sleep slow waves in humans. ... Adult, Brain Mapping, Cerebral Cortex, Circadian Rhythm, Computer Simulation, Cortical Synchronization, Electroencephalography ... Sleep homeostasis and cortical synchronization: III. A high-density EEG study of sleep slow waves in humans. Sleep, 30 (12). pp ... Finally, hd-EEG showed that multipeak waves have multiple cortical origins. CONCLUSIONS: In the human EEG, the decline of SWA ...
Gamma-band Synchronization & Cortical Columns. Robert Moss. Gamma-band synchronization has been an area of interest as a ... Gamma-band Synchronization & Cortical Columns. by SoP , Sep 30, 2013 , Speculations , 0 comments ... Fries, P. (2009). Neuronal gamma-band synchronization as a fundamental process in cortical computation. Annual Review of ... at the cortical level. An action of ACh is to increase the ease with which cortical neurons fire (Krnjević, Pumain, & Renaud, ...
Assembly Synchronization by Oscillation. Integration of information requires "synchrony" of the convergent inputs. Synchrony is ... Cortical interneuron classes have a wide range of preferred frequencies (19, 40, 43), and their diverse frequency-tuning ... R. D. Traub, J. G. R. Jefferys, M. A. Whittington, Fast Oscillations in Cortical Circuits (MIT Press, Cambridge, MA, 1999).. ... D) Voltage-dependent, subthreshold oscillation in layer 2 entorhinal cortical neuron at ∼8 Hz. [Adapted with permission from 40 ...
Synchronization of neuronal activity within and across brain regions is a fundamental property of cortical and subcortical ... Role of cortical interneurons in synchronization of brain electroencephalogram Gerashchenko, Dmitry Harvard University, Boston ... Synchronization of neuronal activity within and across brain regions is a fundamental property of cortical and subcortical ... Role of cortical interneurons in synchronization of brain electroencephalogram. Gerashchenko, Dmitry / Harvard University. $ ...
The Synchronization of Cortical Circuits. One possible functional correlate of the aberrant connectivity observed in TRS is ... Fries P. Neuronal gamma-band synchronization as a fundamental process in cortical computation. Annu Rev Neurosci. (2009) 32:209 ... Functions of gamma-band synchronization in cognition: from single circuits to functional diversity across cortical and ... volume and refinement of cortical circuits including synaptic pruning, reinforcement, and neuronal synchronization (5-8). The ...
Synchronization of STN spikes to motor cortex oscillations at 4-50 Hz in PD. Synchronization of STN single units to cortical ... STN spike-cortical gamma synchronization. The use of the spike-timed LFP average for analysis of spike-M1 synchrony (Fig. 3) ... Synchronization of STN spiking with M1 broadband gamma activity in PD. A, Example of spike-timed scalogram, showing cortical ... Synchronization of STN spiking with cortical LFP oscillations in PD. A, Example of simultaneously recorded STN unit activity ( ...
... tions in large-scale cortical circuits is a crucial prelude to a proper knowl- edge of their role in both adaptive and ... edge of their role in both adaptive and pathological cortical processes. Neu- roscience research in this area has much to gain ... lations that exhibit persistent dynamical instabilities reminiscent of cortical activity. We review how the Kuramoto model may ... lations that exhibit persistent dynamical instabilities reminiscent of cortical activity. We review how the Kuramoto model may ...
synchronization gamma band. Brain 121, 2301-2315 (1998).. *PubMed. * Google Scholar. *. 29.. Viterbi, A. J. Error Bounds for ... Moses, D.A., Leonard, M.K., Makin, J.G. et al. Real-time decoding of question-and-answer speech dialogue using human cortical ... Cheung, C. & Chang, E. F. Real-time, time-frequency mapping of event-related cortical activation. J. Neural Eng. 9, 046018 ( ... Real-time decoding of question-and-answer speech dialogue using human cortical activity. *David A. Moses1. , ...
The neural bases of the synchronization ability remain... ... Sensorimotor synchronization (SMS) is a form of referential ... Jancke, L., Loose, R., Lutz, K., Specht, K., & Shah, N. (2000). Cortical activations during paced finger-tapping applying ... Synchronization Error Error Correction Mechanism Sensorimotor Synchronization Phase Correction Response Positive Perturbation ... Repp, B. (2003). Rate limits in sensorimotor synchronization with auditory and visual sequences: the synchronization threshold ...
Here, we studied the unique progression of the dynamic behavior of cortical and hippocampal local field potentials (LFPs) ... In conclusion, these novel findings indicate that oscillatory dynamics pattern of cortical and hippocampal LFPs preceding micro ... but delayed amplitude reduction in cortical (S1/M1) LFP activity occurring at micro-arousal onset; (ii) two abrupt frequency ... the analysis between hippocampal and cortical LFP fluctuations reveal high coherence during τ interval in a broader frequency ...
Izhikevich, E.M.: Which model to use for cortical spiking neurons? IEEE Trans. Neural Netw. 15, 1063-1070 (2004)CrossRefGoogle ... Ma, J., Song, X.L., Jin, W.Y., et al.: Autapse-induced synchronization in a coupled neuronal network. Chaos Solitons Fract. 80 ... Wang, B.Y., Gong, Y.B.: Effects of channel noise on synchronization transitions in delayed scale-free network of stochastic ... Wang, C.N., He, Y.J., Ma, J., et al.: Parameters estimation, mixed synchronization, and antisynchronization in Chaotic Systems ...
... slow waves and cortical synchronization: II. A local field potential study in the rat, Sleep, … ... Sleep homeostasis, slow waves and cortical synchronization: II. A local field potential study in the rat. by Vyazovskiy, V. V ... V. V. Vyazovskiy, C. Cirelli and G. Tononi, Sleep homeostasis, slow waves and cortical synchronization: II. A local field ... Sleep homeostasis, slow waves and cortical synchronization: II. A local field potential study in the rat ...
Finally, hd-EEG showed that multipeak waves have multiple cortical origins. CONCLUSIONS: In the human EEG, the decline of SWA ... EEG recordings to explore slow-wave parameters over the entire cortical mantle. DESIGN: 256-channel EEG recordings in humans ... large-scale computer simulations of the sleeping thalamocortical system showed that a decrease in cortical synaptic strength is ... by changes in slow-wave parameters that were predicted by a computer model simulating a homeostatic reduction of cortical ...
Abnormalities of Cortical Neural Synchronization Mechanisms in Subjects with Mild Cognitive Impairment due to Alzheimers and ... Abnormalities of Cortical Neural Synchronization Mechanisms in Subjects with Mild Cognitive Impairment due to Alzheimers and ... Abnormalities of Cortical Neural Synchronization Mechanisms in Subjects with Mild Cognitive Impairment due to Alzheimers and ... T1 - Abnormalities of Cortical Neural Synchronization Mechanisms in Subjects with Mild Cognitive Impairment due to Alzheimers ...
SYNCHRONIZATION OF NARROW-BAND CORTICAL OSCILLATORY RESPONSE TO FLASH STIMULATION AND MUSCARINIC BLOCKING IN HUMANS. Sannita, ...
... elite karate athletes are characterized by a reduced cortical activation during the judgment of karate ac ... Here we tested two working hypotheses on spatially selective cortical activation (neural efficiency) in experts: (i) compared ... Cortical Synchronization. Electroencephalography. Female. Humans. Judgment / physiology*. Male. Martial Arts*. Motion ... The EEG cortical sources were estimated by sLORETA. With reference to a pre-stimulus period, the power decrease of alpha (8-12 ...
Experience Dependent Plasticity Alters Cortical Synchronization. Kilgard MP, Vazquez JL, Engineer ND, Pandya PK.. Hearing ...
Hipp, Joerg F.; Engel, Andreas K.; Siegel, Markus (January 2011). "Oscillatory Synchronization in Large-Scale Cortical Networks ... The synchronization hypothesis has never been directly tested but is indirectly supported by several lines of experimental ... Luria, Aleksandr Romanovich (1980). Higher cortical functions in man (2nd ed.). New York: Basic Books. ISBN 978-0465029600. ... Vyshedskiy, Andrey; Dunn, Rita (29 December 2015). "Mental synthesis involves the synchronization of independent neuronal ...
Brainstem networks: reticulo-cortical synchronization in generalized convulsive seizures. In: Noebels JL, Avoli M, Rogawski MA ...
Cortical Synchronization and Perceptual Framing. Journal of Cognitive Neuroscience. Volume 9, Issue 1 (January 1997) ...
State-Dependent Cortical Synchronization Networks Revealed by TMS-EEG Recordings. Kitajo, Keiichi (et al.) ... Exploring the Asymmetrical Cortical Activity in Motor Areas Using Support Vector Machines ... Modelling the Hypothalamic Control of Thalamic Synchronization Along the Sleep-Wake Cycles ...
Spatial Synchronization of Cortical and Subcortical Potentials in Rabbits During Formation of Conditioned Reflexes ... Electroencephalographic Investigation of Cortical Relationships in Dogs During Formation of a Conditioned Reflex Stereotype ... Relationship between Distant Synchronization and Steady Potential Shifts in the Cerebral Cortex ... Ephaptic Transmission of Excitation as a Factor in the Synchronization of Neuronal Activity ...
Sohmiya, T., Sohmiya, S., & Sohmiya, K. (1999). Pattern of cortical activity, degree of synchronization, binocular fusion, and ... Horne, E. P., & Hart, H. C. (1960). Perceptual thresholds and spontaneous cortical rhythms. Journal of General Psychology, 62, ... Grossberg, S. (1987). Cortical dynamics of three-dimensional form, color, and brightness perception: II. Binocular theory. ... Grossberg, S. (1997). Cortical dynamics of three-dimensional figure-ground perception of two-dimensional pictures. ...
  • Transient synchronization of neural activity has been proposed as a neural correlate of conscious perception. (jneurosci.org)
  • However, these studies have investigated synchronization in spatially restricted neural assemblies, or without distinguishing between local and global coordination. (jneurosci.org)
  • We found that visible and invisible conditions differed with respect to large-scale synchronization but not local neural processing. (jneurosci.org)
  • The neural bases of the synchronization ability remain unknown, even in the simpler, paradigmatic task of finger tapping to a metronome. (springer.com)
  • While earlier research showed that tactile stimulation can interrupt pain input at the spinal cord ( 25 ⇓ - 27 ), recent studies, using stimulation of Aβ afferents, have demonstrated that cortical and subcortical neural circuitry also modulate the analgesic effect of tactile stimulation ( 17 , 28 , 29 ). (pnas.org)
  • Furthermore, current perspectives on the neural correlates of consciousness suggest that cortical and thalamocortical effective connectivity is critical for conscious processing ( 20 , 21 ). (pnas.org)
  • It was found that the neural network of the brain was more active, and the synchronization strength reduced in the frontal and temporal regions due to the Pilates training. (hindawi.com)
  • Rhythm complexity modulates behavioural and neural dynamics during auditory-motor synchronization. (mcgill.ca)
  • In large-scale oscillations, amplitude changes are considered to result from changes in synchronization within a neural ensemble , also referred to as local synchronization. (wikipedia.org)
  • In addition to local synchronization, oscillatory activity of distant neural structures (single neurons or neural ensembles) can synchronize. (wikipedia.org)
  • Neural oscillations and synchronization have been linked to many cognitive functions such as information transfer, perception, motor control and memory. (wikipedia.org)
  • Neural correlates of auditory temporal predictions during sensorimotor synchronization. (mpg.de)
  • Teams on the same wavelength perform better: Inter-brain phase synchronization constitutes a neural substrate for social facilitation. (mpg.de)
  • Microsaccade-rhythmic modulation of neural synchronization and coding within and across cortical areas V1 and V2. (bioportfolio.com)
  • EEG phase synchronization of the cortical brain region (CEREBRAL CORTEX). (harvard.edu)
  • ARAS emerges from neuronal nuclei located in midbrain and pons and projects to sub-cortical structures that stimulate cerebral cortex and generate fast EEG oscillations 7 . (nature.com)
  • We report here on (1) a summary of the layout of cortical areas associated with vision and with other modalities, (2) a computerized database for storing and representing large amounts of information on connectivity patterns, and (3) the application of these data to the analysis of hierarchical organization of the cerebral cortex. (psu.edu)
  • Both perceived and nonperceived words caused a similar increase of local (gamma) oscillations in the EEG, but only perceived words induced a transient long-distance synchronization of gamma oscillations across widely separated regions of the brain. (jneurosci.org)
  • Dynamics of human subthalamic neuron phase-locking to motor and sensory cortical oscillations during movement. (harvard.edu)
  • Understanding the fundamental mechanisms governing fluctuating oscillations in large-scale cortical circuits is a crucial prelude to a proper knowledge of their role in both adaptive and pathological cortical processes. (frontiersin.org)
  • The extended model elicits elaborate spatial patterns of synchronous oscillations that exhibit persistent dynamical instabilities reminiscent of cortical activity. (frontiersin.org)
  • Bressler and Freeman, 1980 ), to motor-related modulations in cortical beta oscillations observable in extracranial recordings (e.g. (frontiersin.org)
  • We believe that unraveling the laws governing fluctuations in large-scale cortical oscillations is a necessary precursor to understanding their role in adaptive and pathological cortical functions. (frontiersin.org)
  • While REM sleep is characterized by some physiological similarities to waking states in cortical electroencephalogram (EEG), such as low amplitude and high-frequency oscillations, SWS is defined by a high amplitude and low-frequency oscillations 4 . (nature.com)
  • Conscious perception is associated not only with an increase in gamma power, but also with long-range synchronization of gamma (30-80 Hz) oscillations ( 19 ). (pnas.org)
  • Specifically, cortical rhythms, or oscillations, can effectively rally groups of neurons in widely dispersed regions of the brain to engage in coordinated activity, much like a conductor will summon up various sections of an orchestra in a symphony. (futurity.org)
  • Hayek (1952) was the first to formalize it in large-scale cortical networks (or "maps") that represent all experience acquired through the senses. (scholarpedia.org)
  • Oscillatory activity in groups of neurons generally arises from feedback connections between the neurons that result in the synchronization of their firing patterns. (wikipedia.org)
  • Here's something to wash down the above with: 40 Hz gamma synchronization occurs preceedingly processing by populations of cortical neurons. (bio.net)
  • Those internal fields focus on large-scale patterns of synchronization involving distinct cortical areas within a larger functional network. (futurity.org)
  • Further, interactions between basal ganglia spiking and higher frequency cortical activity have not been explored. (jneurosci.org)
  • Thus, analysis of the interaction of basal ganglia spiking with cortical broadband could yield great insight into basal ganglia-cortex dynamics in PD. (jneurosci.org)
  • Besides dysfunction of the basal ganglia network, alterations of cortical oscillatory coupling, particularly between prefrontal and (pre-)motoric areas, are thought to underlie this impairment. (uni-koeln.de)
  • Modeling effects of cerebellar and basal ganglia lesions on adaptation and anticipation during sensorimotor synchronization. (mpg.de)
  • Understanding large-scale neuronal dynamics - and how they relate to the cortical anatomy - is one of the key areas of neuroscience research. (plos.org)
  • In recent years, there has been increasing interest in estimating the cortical sources of scalp measured electrical activity for cognitive neuroscience experiments. (jove.com)
  • In contrast, CIR cells have dispersed projections wherein various adjacent cells connect to non-specific different cortical areas. (wikipedia.org)
  • If neurons only cared about what was happening in their local environment, then it would be difficult to get neurons to work together if they happened to be in different cortical areas," says Canolty. (futurity.org)
  • Cortical computation unfolds in the interplay between neuronal dynamics and structural neuronal connectivity. (nih.gov)
  • This segmentation and selection can be elegantly achieved if structural connectivity interacts with neuronal synchronization. (nih.gov)
  • In this paper, we provide a brief introduction to the Kuramoto model in its original, rather abstract, form and then focus on modifications that increase its neurobiological plausibility by incorporating topological properties of local cortical connectivity. (frontiersin.org)
  • The essence of the concept is that mnemonic information is stored in network-like patterns of cortical connectivity established by experience. (scholarpedia.org)
  • In the context of fMRI, fine-scale granularity in cortical patterns in fMRI data refers to voxel-by-voxel (or vertex-by-vertex) variation in response and connectivity profiles. (elifesciences.org)
  • Cortical patterns of activity and connectivity are modeled as mixtures of these topographic basis functions. (elifesciences.org)
  • We highlight the roles of subcortical regions (and their subunits) such as the bed nucleus of the stria terminalis, the amgydala, and the hippocampus, as well as their connectivity to cortical regions such as dorsal medial and lateral prefrontal/cingulate cortex and insula in maintaining anxiety responding. (bmj.com)
  • As demonstrated for cortical FS interneurons, these gap junctions in the striatum may cause synchronized spiking, which would increase the influence that FS neurons have on spiking by the striatal medium spiny (MS) neurons. (nih.gov)
  • To explore the roles of gap junctions on activity and spike synchronization in a striatal FS population, we built a network model of FS interneurons. (nih.gov)
  • Complementary networks of cortical somatostatin interneurons enforce layer specific control. (berkeley.edu)
  • Cortical gamma band synchronization through somatostatin interneurons. (berkeley.edu)
  • Inhibitory interneurons of the neocortex are diverse and they have been implicated in many distinct cortical functions. (physiology.org)
  • Zero-lag synchronization between distant cortical areas has been observed in a diversity of experimental data sets and between many different regions of the brain. (plos.org)
  • We call this manner of facilitating zero-lag synchrony resonance-induced synchronization , outline the conditions for its occurrence, and propose that it may be a general mechanism to promote zero-lag synchrony in the brain. (plos.org)
  • The study of large-scale brain dynamics, and the cortical networks on which they unfold, is a very active research area, providing new insights into the mechanisms of functional integration and complementing the traditional focus on functional specialization in the brain [1] , [2] . (plos.org)
  • According to a hypothesised cortical model for natural audiovisual stimulation, phase synchronised communications between participating brain regions play a mechanistic role in natural audiovisual perception. (diva-portal.org)
  • Synchronization of neuronal activity within and across brain regions is a fundamental property of cortical and subcortical networks needed for normal brain functions. (grantome.com)
  • In other words, do cortical neurons fire differently depending on how long the brain has been awake? (pubmedcentralcanada.ca)
  • Alpha rhythm changes during the Pilates training over the different regions and the whole brain were mainly analyzed, including power spectral density and global synchronization index (GSI). (hindawi.com)
  • i have some friends reading steven strogatz's "sync" right now - a really fascinating book if you're interested in how universal synchronization really is, both in the data networks you work with, the brain networks I work with, and all kinds of other mechanical, quantum, and biological systems. (blogspot.com)
  • In 1984, Dr. Brockopp analyzed audio-visual brain stimulation and in particular hemispheric synchronization during EEG monitoring. (project-meditation.org)
  • Methods and apparatuses are described for monitoring synchronization of two or more brain areas and delivering an electrical therapy to the brain to facilitate synchronization of the two or more brain areas. (google.com)
  • Brain synchronization during perception of facial emotional expressions with natural and unnatural dynamics. (mpg.de)
  • A prominent feature of the primate brain is the existence of several cortical areas in which neurons respond categorically to certain visual stimuli. (dartmouth.edu)
  • This effect is particularly notable when it occurs between brain regions across the two cortical hemispheres. (ucsd.edu)
  • When the research team repeated these measurements in mice that lacked anatomical connections between brain hemispheres, however, the synchronization decreased. (ucsd.edu)
  • Synchronization in functional networks of the human brain submitted to J. Nonlinear Sci. (tu-berlin.de)
  • Remarkably, we find that this effect can propagate along chains of coupled nodes and hence holds the potential to promote stable zero-lag synchrony in larger sub-networks of cortical systems. (plos.org)
  • We propose that the transient large-scale synchronization is the critical event that triggers these subsequent processes by enhancing the saliency of the activation patterns sufficiently to permit access to consciousness. (jneurosci.org)
  • It seems likely that there are other frequency-to-size cortical tissue activation patterns as well. (thescienceofpsychotherapy.com)
  • Intersubject synchronization of cortical activity during natural vision. (semanticscholar.org)
  • We reviewed one study that showed a greater area of cortical activation happens at the low frequency while the gamma frequency activity activates column sized areas. (thescienceofpsychotherapy.com)
  • Thus, instead of the current predominant view that association memories are first "stored" in the hippocampus and later somehow transferred to other locations such as the cortex, this theory says the columns originally involved in processing are the same as those involved in the memory and hippocampal activity is critical in facilitating the cortical memory. (thescienceofpsychotherapy.com)
  • This may indicate a cortical area involving a large number of columns has increased activity such that when the expected stimulus occurs, the involved columns are primed to respond faster. (thescienceofpsychotherapy.com)
  • Synchronization of electroencephalogram (EEG) in the frequency range of 1-4 Hz, referred to as slow wave activity (SWA), is observed during slow wave sleep and is thought to be essential for the recuperative function of sleep. (grantome.com)
  • Regarding the hypothesis of intermediate cortical activity in amateur karate athletes, low- and high-frequency alpha ERD was less pronounced in dorsal pathways across the non-athletes, the amateur karate athletes, and the elite karate athletes. (biomedsearch.com)
  • Commentary: Cortical activity in the null space: permitting preparation without movement. (nih.gov)
  • Direct measurements of activity in cortical area V1 show that the neurons that represented the area of the scotoma become sensitive to activity in the surrounding visual field. (wikibooks.org)
  • Thalamic nuclei project to cortical areas of distinct architectural organization and relay the processed information back to the area of original activity in the thalamus via corticothalamic ( CT ) fibers. (wikipedia.org)
  • The nTMS MT and event-related desynchronization (ERD) of beta-band MEG activity and SICI and the beta-band MEG event-related synchronization (ERS) were correlated, but less strongly. (hindawi.com)
  • CORTICAL electrical activity, reflected in the electroencephalogram (EEG), has a long and controversial history related to anesthesia, [1,2] and recent studies have emphasized both its useful aspects [3-5] and limitations. (asahq.org)
  • Because GIN cells are more readily activated than RS and FS cells, it is possible that they act as "first responders" when cortical excitatory activity increases. (physiology.org)
  • These characteristics suggest that GIN cells are activated steadily during states of enhanced cortical firing and could act as an important regulator of normal and/or pathological cortical activity. (physiology.org)
  • In comparing Binaural beats against Monaural beats, Oster noted that Monaural beats were shown to elicit extremely strong cortical responses , which is the electrical activity responsible for entrainment. (project-meditation.org)
  • Anodal tDCS modulates cortical activity and synchronization in Parkinson's disease depending on motor processing. (uni.lu)
  • An action of ACh is to increase the ease with which cortical neurons fire (Krnjević, Pumain, & Renaud, 1971), which increases cell firing rates. (thescienceofpsychotherapy.com)
  • Here we found that after sustained wakefulness cortical neurons fire at higher frequencies in all behavioral states. (pubmedcentralcanada.ca)
  • Here, we investigated the model's predictions in humans by using all-night high-density (hd)-EEG recordings to explore slow-wave parameters over the entire cortical mantle. (surrey.ac.uk)
  • It suggests that focusing attention arises from interactions between widespread cortical and subcortical networks that may be regulated via their rhythmic synchronization. (dartmouth.edu)
  • Inhibitory Circuits in Cortical Layer 5. (berkeley.edu)
  • Gain control by layer six in cortical circuits of vision. (berkeley.edu)
  • Lateral competition for cortical space by layer-specific horizontal circuits. (berkeley.edu)
  • The motor system is a dynamic network of cortical and subcortical areas interacting through excitatory and inhibitory circuits, modulated by somatosensory input. (hindawi.com)
  • With reference to a pre-stimulus period, the power decrease of alpha (8-12 Hz) rhythms during the video indexed the cortical activation (event-related desynchronization, ERD). (biomedsearch.com)
  • The bidirectional coupling between a resonance pair acts to mutually adjust their dynamics onto a common and relatively stable synchronized regime, which then propagates and stabilizes the synchronization of other nodes within the motif. (plos.org)
  • In conclusion, these novel findings indicate that oscillatory dynamics pattern of cortical and hippocampal LFPs preceding micro-arousals could be part of the regulatory processes in sleep architecture. (nature.com)
  • Individual differences in rhythmic cortical entrainment correlate with predictive behavior in sensorimotor synchronization. (mpg.de)
  • Neuronal gamma-band synchronization is found in many cortical areas, is induced by different stimuli or tasks, and is related to several cognitive capacities. (nih.gov)
  • Thus, it appears as if many different gamma-band synchronization phenomena subserve many different functions. (nih.gov)
  • I argue that gamma-band synchronization is a fundamental process that subserves an elemental operation of cortical computation. (nih.gov)
  • I propose that this process is at least one of the fundamental functions of gamma-band synchronization, which then subserves numerous higher cognitive functions. (nih.gov)
  • Gamma-band synchronization has been an area of interest as a psychophysical hypothesis in perceptual binding since the late 1980's (Fries, 2009) We recently suggested an alternative interpretation as to how this is involved in higher cortical processes (Moss, Hunter, Shah, & Havens, 2012). (thescienceofpsychotherapy.com)
  • If disrupted or damaged, then the hippocampal neurons may lack the ability to maintain the gamma frequency firing rate which would prevent the cortical columns from forming the associated memory. (thescienceofpsychotherapy.com)
  • Sensorimotor synchronization (SMS) is a form of referential behavior in which an action is coordinated with a predictable external stimulus. (springer.com)
  • Temporal control of movements in sensorimotor synchronization. (springer.com)
  • The Role of the Cerebellum in Sub- and Supraliminal Error Correction during Sensorimotor Synchronization: Evidence from fMRI and TMS. (springer.com)
  • Sensorimotor synchronization with tempo-changing auditory sequences: Modeling temporal adaptation and anticipation. (mpg.de)
  • The time course of phase correction: A kinematic investigation of motor adjustment to timing perturbations during sensorimotor synchronization. (mpg.de)
  • The ADaptation and Anticipation Model (ADAM) of sensorimotor synchronization. (mpg.de)
  • Our results show a clear segregation between regions engaged during self-related introspective processes and cortical regions involved in sensorimotor processing. (wired.com)
  • Mammalian cortical neurons form behavior-dependent oscillating networks of various sizes, which span five orders of magnitude in frequency. (sciencemag.org)
  • Here, we studied the unique progression of the dynamic behavior of cortical and hippocampal local field potentials (LFPs) during slow-wave sleep-related to motor-bursts (micro-arousals) in mice. (nature.com)
  • Results indicated that cross-communications between the frontal lobes, intraparietal associative areas and primary auditory and occipital cortices are specifically enhanced during natural face-speech perception and that phase synchronisation mediates the functional exchange of information associated with face-speech processing between both sensory and associative regions in both hemispheres. (diva-portal.org)
  • Reorganization of Large-Scale Functional Networks During Low-Frequency Electrical Stimulation of the Cortical Surface. (nih.gov)
  • Individual transformation matrices project information from individual anatomical spaces into the common model information space, preserving the geometry of pairwise dissimilarities between pattern vectors, and model cortical topography as mixtures of overlapping, individual-specific topographic basis functions, rather than as contiguous functional areas. (elifesciences.org)
  • In this Perspective, we present the conceptual framework that motivates hyperalignment, its computational underpinnings for joint modeling of a common information space and idiosyncratic cortical topographies, and discuss implications for understanding the structure of cortical functional architecture. (elifesciences.org)
  • encompasses a family of computational algorithms that align shared information in a common, high-dimensional information space, rather than attempting to align functional topographies in the physical space of cortical anatomy to a canonical topography. (elifesciences.org)
  • Hyperalignment derives from the term hyperspace, to convey the paradigm shift from modeling cortical functional architecture in a three-dimensional anatomical space to modeling the information encoded in functional architecture in a high-dimensional information space. (elifesciences.org)
  • Our computational framework introduces a new model of cortical functional architecture. (elifesciences.org)
  • supports the notion that unconsciously processed stimuli activate high-level cortical areas. (jneurosci.org)
  • 1992) developed a technique for probing the cortical blind spot using vertical and horizontal bar stimuli. (wikibooks.org)
  • Chakravartula S, Indic P, Sundaram B, Killingback T. Emergence of local synchronization in neuronal networks with adaptive couplings. (harvard.edu)
  • It is increasingly accepted that memory is one such function, some of its components localized in neuronal networks circumscribed to discrete domains of cortex and others widely distributed in networks extending beyond the boundaries of cortical areas defined by cellular architecture. (scholarpedia.org)
  • Modifications of cortical excitability enable recovery and reorganization of the remaining motor areas both in animal models [ 4 , 5 ] and in humans [ 1 , 6 ]. (hindawi.com)
  • and recent studies show that cortical areas that have been "used" more during waking show higher SWA relative to less engaged areas (e.g. (pubmedcentralcanada.ca)
  • In recent years, many new cortical areas have been identified in the macaque monkey. (psu.edu)
  • Sleep homeostasis, slow waves and cortical synchronization: II. (wisc.edu)
  • V. V. Vyazovskiy, C. Cirelli and G. Tononi, 'Sleep homeostasis, slow waves and cortical synchronization: II. (wisc.edu)
  • Thus, i) sleep EEG slow waves reflect the transition between up and down states of cortical neurons, and ii) EEG SWA is a marker of sleep homeostasis and presumably of sleep need. (pubmedcentralcanada.ca)
  • Increased cortical involvement and synchronization during CAP A1 slow waves. (nih.gov)
  • Interestingly, global synchronization involving more than 188 different electrodes also appeared every 300-500 msec, even before the presentation of the first target, in those participants that were able to detect the second target. (blogspot.com)
  • Based on the improved neuron model with electromagnetic induction being considered, the bidirectional coupling-induced synchronization behaviors between two coupled neurons are investigated on Spice tool and also printed circuit board. (springer.com)
  • iii) a pattern of cortico-hippocampal frequency communication precedes micro-arousals: the analysis between hippocampal and cortical LFP fluctuations reveal high coherence during τ interval in a broader frequency band (2-12 Hz), while at a lower frequency band (0.5-2 Hz) the coherence reaches its maximum after the onset of micro-arousals. (nature.com)
  • Rats were placed in a stereotaxic apparatus and cortical dural electrodes and hippocampal microelectrodes were chronically implanted. (asahq.org)
  • In agreement with a recent hypothesis, in the first of 3 companion papers, large-scale computer simulations of the sleeping thalamocortical system showed that a decrease in cortical synaptic strength is sufficient to account for the decline in SWA. (surrey.ac.uk)
  • Adaptive temporal encoding leads to a background-insensitive cortical representation of speech. (semanticscholar.org)
  • Leading the follower: An fMRI investigation of dynamic cooperativity and leader-follower strategies in synchronization with an adaptive virtual partner. (mpg.de)
  • If these are actually two separable components, the slower oscillation could be a good candidate for synchronization with events in the external world (such as expectation of a target). (blogspot.com)
  • First, the phase locking value (PLV) is calculated as a feature of phase synchronization, then the calculated correlation coefficients of the phase synchronization features are used to construct two pairs of class. (springer.com)
  • Interbrain cortical synchronization encodes multiple aspects of social interactions in monkey pairs. (nih.gov)
  • Each cortical electrode was implanted through a 1-mm burr hole to contact the dura mater, and affixed to jeweler's screws placed in the skull. (asahq.org)
  • However, the effects of these abnormalities on cortical function are poorly understood. (jneurosci.org)
  • Musical training enhances temporal adaptation of auditory-motor synchronization. (mcgill.ca)
  • Lagged-phase synchronisation measures were computed for conditions of eye-closed rest (REST), speech-only (auditory-only, A), face-only (visual-only, V) and face-speech (audio-visual, AV) stimulation. (diva-portal.org)
  • Furthermore, phase synchronisation between cortical regions was modulated in parallel within multiple frequency bands. (diva-portal.org)
  • we measured over a wide frequency range (1) time-resolved power changes of local signals and (2) phase synchronization across recording sites. (jneurosci.org)
  • Monaco JD, De Guzman RM, Blair HT, Zhang K. Spatial synchronization codes from coupled rate-phase neurons. (harvard.edu)
  • In this paper, a method based on phase synchronization analysis and common spatial pattern (CSP) algorithm is proposed. (springer.com)
  • Brains swinging in concert: Cortical phase synchronization while playing guitar. (mpg.de)
  • Layer-specific excitation/inhibition balances during neuronal synchronization in the visual cortex. (berkeley.edu)
  • Sensory experience regulates cortical inhibition by inducing IGF1 in VIP neurons. (berkeley.edu)
  • CONCLUSIONS: In the human EEG, the decline of SWA during sleep is accompanied by changes in slow-wave parameters that were predicted by a computer model simulating a homeostatic reduction of cortical synaptic strength. (surrey.ac.uk)
  • In search of common foundations for cortical computation. (francoangeli.it)
  • Sleep homeostasis and cortical synchronization: III. (surrey.ac.uk)