The propagation of the NERVE IMPULSE along the nerve away from the site of an excitation stimulus.
An impulse-conducting system composed of modified cardiac muscle, having the power of spontaneous rhythmicity and conduction more highly developed than the rest of the heart.
A small nodular mass of specialized muscle fibers located in the interatrial septum near the opening of the coronary sinus. It gives rise to the atrioventricular bundle of the conduction system of the heart.
Impaired conduction of cardiac impulse that can occur anywhere along the conduction pathway, such as between the SINOATRIAL NODE and the right atrium (SA block) or between atria and ventricles (AV block). Heart blocks can be classified by the duration, frequency, or completeness of conduction block. Reversibility depends on the degree of structural or functional defects.

Ringo, Doty, Demeter and Simard, Cerebral Cortex 1994;4:331-343: a proof of the need for the spatial clustering of interneuronal connections to enhance cortical computation. (1/3268)

It has been argued that an important principle driving the organization of the cerebral cortex towards local processing has been the need to decrease time lost to interneuronal conduction delay. In this paper, I show for a simplified model of the cerebral cortex, using analytical means, that if interneuronal conduction time increases proportional to interneuronal distance, then the only way to increase the numbers of synaptic events occurring in a fixed finite time period is to spatially cluster interneuronal connections.  (+info)

Spinal cord-evoked potentials and muscle responses evoked by transcranial magnetic stimulation in 10 awake human subjects. (2/3268)

Transcranial magnetic stimulation (TCMS) causes leg muscle contractions, but the neural structures in the brain that are activated by TCMS and their relationship to these leg muscle responses are not clearly understood. To elucidate this, we concomitantly recorded leg muscle responses and thoracic spinal cord-evoked potentials (SCEPs) after TCMS for the first time in 10 awake, neurologically intact human subjects. In this report we provide evidence of direct and indirect activation of corticospinal neurons after TCMS. In three subjects, SCEP threshold (T) stimulus intensities recruited both the D wave (direct activation of corticospinal neurons) and the first I wave (I1, indirect activation of corticospinal neurons). In one subject, the D, I1, and I2 waves were recruited simultaneously, and in another subject, the I1 and I2 waves were recruited simultaneously. In the remaining five subjects, only the I1 wave was recruited first. More waves were recruited as the stimulus intensity increased. The presence of D and I waves in all subjects at low stimulus intensities verified that TCMS directly and indirectly activated corticospinal neurons supplying the lower extremities. Leg muscle responses were usually contingent on the SCEP containing at least four waves (D, I1, I2, and I3).  (+info)

Multiple point electrical stimulation of ulnar and median nerves. (3/3268)

A computer-assisted method of isolating single motor units (MUs) by multiple point stimulation (MPS) of peripheral nerves is described. MPS was used to isolate 10-30 single MUs from thenar and hypothenar muscles of normal subjects and patients with entrapment neuropathies, with the original purpose of obtaining a more representative mean motor unit potential for estimating the number of MUs in a muscle. The two important results that evolved from MPS however, were: (1) in the absence of 'alternation' MUs were recruited in an orderly pattern from small to large, and from longer to shorter latencies by graded electrical stimulation in both normal and pathological cases, (2) a comparison of the sizes of MUs recruited by stimulation proximal and distal to the elbow suggested that axonal branching can occur in the forearm 200 mm or more proximal to the motor point in intrinsic hand muscles.  (+info)

Acute conduction velocity changes in guinea-pigs after administration of diphenylhydantoin. (4/3268)

Motor nerve conduction velocity was measured after dosing guinea-pigs with 200-400 mumol/kg diphenylhydantoin (DPH) daily for three to four days. Conduction velocity fell by a mean value of 13% in animals that achieved plasma DPH levels over 200 mumol/l. There was no change in velocity with DPH levels below this value.  (+info)

Electrophysiological evidence for tetrodotoxin-resistant sodium channels in slowly conducting dural sensory fibers. (5/3268)

A tetrodotoxin (TTX)-resistant sodium channel was recently identified that is expressed only in small diameter neurons of peripheral sensory ganglia. The peripheral axons of sensory neurons appear to lack this channel, but its presence has not been investigated in peripheral nerve endings, the site of sensory transduction in vivo. We investigated the effect of TTX on mechanoresponsiveness in nerve endings of sensory neurons that innervate the intracranial dura. Because the degree of TTX resistance of axonal branches could potentially be affected by factors other than channel subtype, the neurons were also tested for sensitivity to lidocaine, which blocks both TTX-sensitive and TTX-resistant sodium channels. Single-unit activity was recorded from dural afferent neurons in the trigeminal ganglion of urethan-anesthetized rats. Response thresholds to mechanical stimulation of the dura were determined with von Frey monofilaments while exposing the dura to progressively increasing concentrations of TTX or lidocaine. Neurons with slowly conducting axons were relatively resistant to TTX. Application of 1 microM TTX produced complete suppression of mechanoresponsiveness in all (11/11) fast A-delta units [conduction velocity (c.v.) 5-18 m/s] but only 50% (5/10) of slow A-delta units (1.5 +info)

Diaphragm electromyogram measured with unilateral magnetic stimulation. (6/3268)

The purpose of this study was to establish the phrenic nerve conduction time (PNCT) for magnetic stimulation and further assess the relatively new technique of anterior unilateral magnetic stimulation (UMS) of the phrenic nerves in evaluating the diaphragm electromyogram (EMG). An oesophageal electrode was used to record the diaphragm compound muscle action potential (CMAP) elicited by supramaximal percutaneous electrical phrenic nerve stimulation (ES) and UMS from eight normal subjects. The oesophageal electrode used for recording the CMAP was positioned at the level of the hiatus and 3 cm below. The diaphragm CMAP was also recorded from chest wall surface electrodes in five subjects. All of the phrenic nerves could be maximally stimulated with UMS. A clear plateau of the amplitude of the CMAP was achieved for the right and left phrenic nerves. The mean amplitudes of the CMAP recorded from the oesophageal electrode were, for the right side, 0.74+/-0.29 mV (mean+SD) for ES and 0.76+/-0.30 mV for UMS with maximal power output, and for the left side 0.88+/-0.33 mV for ES and 0.80+/-0.24 mV for UMS. PNCT measured by the oesophageal electrode with ES and UMS with maximal output were, for the right side, 7.0+/-0.8 ms and 6.9+/-0.8 ms, respectively, and for the left side 7.8+/-1.2 ms and 7.7+/-1.3 ms, respectively. However, the CMAP recorded from chest wall surface electrodes with UMS was unsuitable for the measurement of PNCT. The results suggest that unilateral magnetic stimulation of the phrenic nerves combined with an oesophageal electrode can be used to assess diaphragmatic electrical activity and measure the phrenic nerve conduction time.  (+info)

Activity-dependent slowing of conduction differentiates functional subtypes of C fibres innervating human skin. (7/3268)

1. The effects of impulse activity on conduction in cutaneous C fibres have been examined in 46 microneurographic recordings from 11 normal subjects and 11 diabetic patients with normal nerve conduction. A tungsten microelectrode was inserted into a cutaneous nerve, usually the superficial peroneal close to the ankle, and intraneural microstimulation was used to identify an area of skin innervated. Three minute trains of 0.25 ms stimuli at 1, 2 and 4 Hz were then delivered to the surface of the skin, separated by intervals of 6 min with stimulation at 0.25 Hz. Slowing and block of conduction were measured from the nerve responses for up to seven C units per stimulation sequence. 2. Three types of C unit were distinguished by their responses to repetitive stimulation: type 1 units slowed progressively during the 3 min trains; slowing of type 2 units reached a plateau within 1 min; while type 3 units hardly slowed at all. Data from normal and diabetic subjects did not differ and were pooled. After 3 min at 2 Hz, the percentage increases in latency were for type 1, 28.3 +/- 9.7 (n = 63 units, mean +/- s.d.); for type 2, 5.2 +/- 1.6 (n = 14); and for type 3, 0.8 +/- 0.5 (n = 5), with no overlap. After 3 min at 4 Hz, 58 % of type 1 units (but no type 2 or 3 units) blocked intermittently. Recovery of latency after stimulation was faster for type 2 than for type 1 units, but conduction velocities of the three types were similar. 3. Type 1 units were identified as nociceptors and 7 type 2 units were identified as 'cold' fibres, activated by non-noxious cold, with no overlap in modality. None of the units tested was activated by weak mechanical stimuli or reflex sympathetic activation. 4. Spike waveforms were averaged for 18 type 1, 10 type 2 and 6 type 3 units. All units had predominantly triphasic action potentials with a major negative peak, but those of type 3 units were on average both smaller and briefer than those of type 1 and type 2 units. 5. It is concluded that repetitive electrical stimulation reliably differentiates nociceptive from cold-specific C fibres innervating human hairy skin, as has previously been shown for the rat. Cold fibres can propagate impulses continuously at much higher rates than nociceptive fibres. The nature of the type 3 units is unclear.  (+info)

Thapsigargin inhibits a potassium conductance and stimulates calcium influx in the intact rat lens. (8/3268)

1. An increase in lens cell calcium has long been associated with cortical cataract. Recently, it has been shown that thapsigargin induces a rise in lens cell calcium by release from endoplasmic reticulum stores. The effects of this rise on the optical and membrane characteristics of the lens were studied in the isolated rat lens. 2. The electrical characteristics of the isolated, perifused rat lens were measured using a two-internal microelectrode technique that permits measurement of plasma membrane conductance (Gm), membrane potential (Vm) and junctional conductance in the intact lens. 3. Thapsigargin (1 microM) induced a rapid overall depolarization of Vm that was accompanied by first a decrease and then an increase in Gm. 4. Replacing external Na+ with tetraethylammonium (TEA) abolished the decrease in Gm. However, a transient increase phase was still observed. 5. The changes in conductance were further characterized by measuring 22Na+ and 45Ca2+ influxes into the isolated lens. Thapsigargin (1 microM) induced a transient increase in 45Ca2+, but did not affect Na+ influx. 6. The Ca2+ channel blocker La3+ (10 microM) totally inhibited the thapsigargin-induced Ca2+ influx. It also blocked the increase in Gm observed in control and in Na+-free-TEA medium. In the absence of external calcium, thapsigargin induced a small depolarization in Vm. 7. These data indicate that thapsigargin induces both a decrease in K+ conductance and an increase in Ca2+ conductance. These probably result from release of stored Ca2+ and subsequent activation of store-operated Ca2+ channels (capacitative Ca2+ entry). 8. Thapsigargin application over the time course of these experiments (24 h) had no effect on junctional conductance or on the transparency of the lens.  (+info)

The Atrioventricular (AV) node is a specialized group of cardiac muscle cells located in the wall of the right atrium, between the two atrial chambers of the heart. It acts as a relay station, receiving electrical impulses from the sinoatrial (SA) node in the right atrium and sending them to the ventricles to initiate their contraction. The AV node is responsible for controlling the rate and rhythm of the heartbeat, and any problems with the AV node can lead to arrhythmias or abnormal heart rhythms.

Heart block is a condition in which the electrical signals that regulate the heartbeat are slowed or blocked as they travel through the heart's conduction system. This can cause the heart to beat too slowly (bradycardia) or irregularly, which can lead to symptoms such as dizziness, fainting, and shortness of breath. There are three main types of heart block: first-degree, second-degree, and third-degree. First-degree heart block is the mildest form and usually does not cause any symptoms. Second-degree heart block is more serious and can cause symptoms, especially if it is caused by an underlying heart condition. Third-degree heart block is the most serious form and can lead to life-threatening complications if not treated promptly. Heart block can be caused by a variety of factors, including damage to the heart muscle, certain medications, and inherited conditions. Treatment options depend on the severity of the heart block and the underlying cause. In some cases, a pacemaker may be necessary to regulate the heartbeat.

... and speed of neural conduction. Various instruments have been employed to measure these things. Brain ERPs allow for the " ... Nerve conduction velocity (NCV) has been studied, giving varying results. Some have hypothesized that "higher intelligence is ... associated with better 'neural efficiency.'" A few studies suggested an association between nerve conduction velocity and ... Knowing how parts of the brain are utilized may reveal more information about the structure and hierarchy used in neural ...
It is the speed at which an electrochemical impulse propagates down a neural pathway. Conduction velocities are affected by a ... Nerve conduction velocity is an important aspect of nerve conduction studies. ... To perform nerve conduction velocity, surface electrodes are placed onto the skin over nerves at various locations. Each patch ... On one hand, certain preoperative information about the overall state of an injured nerve (state of the neural and perineural ...
The other one is the dorsal diencephalic conduction (DDC) system. The two pathways seem to have parallel neural circuits, and ... The medial forebrain bundle (MFB) is a neural pathway containing fibers from the basal olfactory regions, the periamygdaloid ...
Hodgkin, A. L.; Huxley, A. F. (1952). "A quantitative description of membrane current and its application to conduction and ... Neural accommodation or neuronal accommodation occurs when a neuron or muscle cell is depolarised by slowly rising current ( ... Direct link to Hodgkin-Huxley paper #5 via PubMedCentral Neural Impulses: The Action Potential In Action by Garrett Neske, The ... "A quantitative description of membrane current and its application to conduction and excitation in nerve". The Journal of ...
They can only function in collaboration with other neurons and interneurons in a neural circuit. There are an estimated 100 ... Neurons are polarised cells that are specialised for the conduction of action potentials also called nerve impulses. They can ... Perea, G; Araque, A (January 2005). "Synaptic regulation of the astrocyte calcium signal". Journal of Neural Transmission. 112 ... in neural circuits and larger brain networks. The two main neuronal classes in the cerebral cortex are excitatory projection ...
The loss of the myelin insulation either disrupts or prevents neural conduction along the nerve cell's axon. The brain and the ... This insulation helps the axon of a nerve cell with the conduction and speed of the signal along the axon. The pathogenesis of ... Transverse myelitis Neuromyelitis optica Since the neural impulse is inhibited in this condition it may lead to paresthesia, ...
Spiking neural networks with axonal conduction delays exhibit polychronization, and hence could have a very large memory ... An optical neural network is a physical implementation of an artificial neural network with optical components. Dynamic neural ... A probabilistic neural network (PNN) is a four-layer feedforward neural network. The layers are Input, hidden pattern/summation ... Differentiable neural computers (DNC) are an NTM extension. They out-performed Neural turing machines, long short-term memory ...
A microfabricated nerve-on-a-chip platform for rapid assessment of neural conduction in explanted peripheral nerve fibers. Nat ... "A microfabricated nerve-on-a-chip platform for rapid assessment of neural conduction in explanted peripheral nerve fibers". ... "A microfabricated nerve-on-a-chip platform for rapid assessment of neural conduction in explanted peripheral nerve fibers". ... IEEE Transactions on Neural Systems and Rehabilitation Engineering, special issue on Neural interfaces to the Peripheral ...
In neuroscience, nerve conduction velocity (CV) is the speed at which an electrochemical impulse propagates down a neural ... low temperatures slow nerve conduction velocity and higher temperatures increase conduction velocity). Conduction velocities in ... However, conduction velocity of the Sural nerve is not associated with age. In general, conduction velocities in the upper ... Nerve conduction latencies are typically on the order of milliseconds. Although conduction velocity itself is not directly ...
Neural tissues depend on this process for energy, and disruption of the cycle would impair cell growth and function. Schwann ... The slowed conduction of action potentials in axons causes segmental demyelination extending proximally; this is also known as ... Thus, neural deterioration occurs in an accelerating cycle: myelin damage reduces conductance, and reduced conductance ... Thiamine deficiency alone could explain the impaired nerve conduction in those with alcoholic polyneuropathy, but other factors ...
Most conduction pathways originate from the cardiogenic mesoderm but the sinus node may be derived from the neural crest. The ... The central part of cardiogenic area is in front of the oropharyngeal membrane and the neural plate. The growth of the brain ... The heartbeat is initiated in the pacemaker regions and spreads to the rest of the heart through a conduction pathway. ... In the splanchnopleuric mesenchyme on either side of the neural plate, a horseshoe-shaped area develops as the cardiogenic ...
When sulfatide is not distributed properly, it can affect the normal physiological conduction of electrical impulses between ... Aside from being a membrane component, sulfatide functions in protein trafficking, cell aggregation and adhesion, neural ... However, how sulfatide buildup causes demyelination and neural degeneration is still mostly unknown. Metachromatic ...
The fastest recorded conduction speed of 210 m/s, is found in the ensheathed axons of some pelagic Penaeid shrimps and the ... Examples of CAMs specific to neural systems include N-CAM, TAG-1 - an axonal glycoprotein - and MAG, all of which are part of ... In saltatory conduction, electrical currents produced at each node of Ranvier are conducted with little attenuation to the next ... The myelinated axons from the cortical neurons form the bulk of the neural tissue called white matter in the brain. The myelin ...
The cause of neurapraxia is a neural lesion which causes a temporary block of nerve conduction without transection of the axon ... A conduction block is classified as a 40% reduction in action potential amplitude over a short distance on the nerve, or a 50% ... potential conduction block over a segment of a nerve fiber and thus a reduction or loss of function in parts of the neural ... As a result of this pressure, ischemia occurs, a neural lesion results, and the human body naturally responds with edema ...
Sensory neurons coupled to scolopidia are also of larger diameter, increasing conduction rate. In some moths, honeybees, and ... due to the physical mechanism of activating a neural impulse. ...
... blocking both initiation and conduction of nerve impulses. Depolarization and repolarization of excitable neural membranes is ...
Biological neuron models GHK current equation Models of neural computation Saltatory conduction Bioelectronics Cable theory ... Exploring Realistic Neural Models with the GEneral NEural SImulation System. New York: Springer Verlag. pp. 29-49. Armstrong CM ... Both types of models may be used to understand the behavior of small biological neural networks, such as the central pattern ... Getting PA (1989). "Reconstruction of Small Neural Networks". In C Koch and I Segev (ed.). Methods in Neuronal Modeling: From ...
The opposite direction of neural activity is afferent conduction, which carries impulses by way of the afferent nerve fibers of ...
This conduction velocity ranges from 1 m/s to over 100 m/s, and generally increases with the diameter of the neuronal process. ... Cognitive architecture Cognitive map Computational neuroscience Motion perception Neural coding Neural correlate Neural ... and the simple neurons often used in Artificial neural networks. Linearity may occur in the basic elements of a neural circuit ... "The Complex Behaviour of a Simple Neural Oscillator Model in the Human Cortex". IEEE Transactions on Neural Systems and ...
... test shows slight neural damage at the biceps and the brachialis muscles with slower motor and sensory conduction over the ...
Sasaki, T., Matsuki, N., Ikegaya, Y. 2011 Action-potential modulation during axonal conduction. Science 331 (6017), pp. 599-601 ... v t e (Orphaned articles from July 2021, All orphaned articles, Neural coding, Electrophysiology, Computational neuroscience, ...
... which increases the signal conduction. In one paper, polypyrrole (PPy) was doped with polystyrene sulfonate (PSS) to ... 2010). "Seeding neural progenitor cells on silicon-based neural probes". Journal of Neurosurgery. 113 (3): 673-681. doi:10.3171 ... 2011). "PEDOT polymer coatings facilitate smaller neural recording electrodes". Journal of Neural Engineering. 8 (1): 014001. ... "Surface immobilization of neural adhesion molecule L1 for improving the biocompatibility of chronic neural probes: In vitro ...
... restoring some lost neural signal conduction. Another way progesterone aids in regeneration includes increasing the circulation ... January 2012). "Progesterone increases circulating endothelial progenitor cells and induces neural regeneration after traumatic ...
Desmedt JE, Cheron G (1980). "Central somatosensory conduction in man: Neural generators and interpeak latencies of the far- ... The NI is the neural structure responsible of the gaze holding. This discovery demonstrated for the first time the biological ... In 1986, he has discovered, together with E. Godaux, the localization of the oculomotor neural integrator (NI) in the nucleus ... Cheron, G.; Godaux, E. (1 December 1987). "Disabling of the oculomotor neural integrator by kainic acid injections in the ...
Biophysical models are used extensively in the study of electrical conduction in single neurons, as well as neural circuit ... Neuroscience - studying neural networks experimentally (brain slicing) as well as theoretically (computer models), membrane ... Computer science - Neural networks, biomolecular and drug databases. Computational chemistry - molecular dynamics simulation, ...
It is easily absorbed into the neural tissue and inhibits the enzyme with minimum side effects. It has been demonstrated in ... motor nerve conduction velocity, thresholds of vibratory sensation and autonomic nerve function as compared to a placebo. These ... experiments that there is an improvement in sorbitol levels and Na+/K+ ATPase activity leading to improved nerve conduction ...
In 2006 Sony patented a neural interface system allowing radio waves to affect signals in the neural cortex. In 2007 NeuroSky ... Hodgkin AL, Huxley AF (August 1952). "A quantitative description of membrane current and its application to conduction and ... Researchers have built devices to interface with neural cells and entire neural networks in cultures outside animals. As well ... Neural dust is a term used to refer to millimeter-sized devices operated as wirelessly powered nerve sensors that were proposed ...
Rinne test, which tests air conduction vs. bone conduction is positive, because both bone and air conduction are reduced ... Neural, or "retrocochlear", hearing loss occurs because of damage to the cochlear nerve (CVIII). This damage may affect the ... I.e. where the neural tuning curve would normally be most sensitive (at the 'tip') (See Figure 5). Where both the OHCs and the ... PTCs are similar to neural tuning curves. They illustrate the level of a masker (dB SPL) tone at threshold, as a function of ...
The era of modern neurology developed from Duchenne's understanding of neural pathways and his diagnostic innovations including ... deep tissue biopsy, nerve conduction tests (NCS), and clinical photography. This extraordinary range of activities (mostly in ...
Stimulating the MLR produces postsynaptic potentials (PSP) in motoneurons with an average conduction velocity of 88 m/s, which ... In most cases, the specific neural structure for this type of feedback is not yet known. However, touch feedback of CPGs have ... There exist neural substrates that control bilateral limb coordination, particularly in the lumbar spinal circuits controlling ... Certain areas of the brain initiate the descending neural pathways that ultimately control and modulate the CPG signals. In ...
Nervous System Physiological Phenomena - Neural Conduction PubMed MeSh Term *Overview. Overview. subject area of * Activation ... Neural control of shortening and lengthening contractions: influence of task constraints Journal Article ... MEASUREMENT OF AXONAL CONDUCTION-VELOCITY IN SINGLE MAMMALIAN MOTOR AXONS Journal Article ... Response of traveling waves to transient inputs in neural fields Journal Article ...
cardiac conduction defects. *sensory-neural hearing loss. Myoneurogenic gastrointestinal encephalopathy (MNGIE) * ...
Neural Conduction / physiology * Occupational Diseases / diagnosis* * Peripheral Nervous System Diseases / diagnosis * Practice ...
... and speed of neural conduction. Various instruments have been employed to measure these things. Brain ERPs allow for the " ... Nerve conduction velocity (NCV) has been studied, giving varying results. Some have hypothesized that "higher intelligence is ... associated with better neural efficiency." A few studies suggested an association between nerve conduction velocity and ... Knowing how parts of the brain are utilized may reveal more information about the structure and hierarchy used in neural ...
Nerve conduction velocity (NCV) is a test to see how fast electrical signals move through a nerve. This test is done along with ... Nuwer MR, Pouratian N. Monitoring of neural function: electromyography, nerve conduction, and evoked potentials. In: Winn HR, ... Often, the nerve conduction test is followed by EMG. In this test, a needle is placed into a muscle and you are told to ... Nerve conduction velocity (NCV) is a test to see how fast electrical signals move through a nerve. This test is done along with ...
Psychometric tests, nerve conduction studies and pCASL neuroimaging assessment were performed. The results showed that the ... Neural plasticity secondary to carpal tunnel syndrome: a pseudo-continuous arterial spin labeling study.. ... Neural plasticity secondary to carpal tunnel syndrome: a pseudo-continuous arterial spin labeling study. ... Neural plasticity secondary to carpal tunnel syndrome: a pseudo-continuous arterial spin labeling study. ...
Ectopic impulse conduction describes the spontaneous development of neural impulses in the compression area. By contrast, the ... The ephaptic impulse conduction is characterized by a pathological transfer of impulses between neighboring nerve fibers (10 12 ...
ABRs may be used to detect auditory neuropathy or neural conduction disorders in newborns. Because ABRs are reflective of ...
The conduction system includes several components. The first part of the conduction system is the sinoatrial (SA) node, located ... Without any neural stimulation, the sinoatrial node rhythmically initiates electrical impulses 70 to 80 times per minute. ... Conduction system. An effective cycle for productive pumping of blood requires that the heart be synchronized accurately. Both ... Specialized cardiac muscle cells that make up the conduction system of the heart coordinate contraction of the chambers. ...
... all GR to L5 inputs had an additional fixed 5 ms conduction delay). The mean input timings in this sequence were chosen to be ... 2006) Neural correlate of subjective sensory experience gradually builds up across cortical areas. Proc Natl Acad Sci USA 103: ... 1998) Neural activity in SII modifies sensory evoked potentials in SI in awake rats. NeuroReport 9:3379-3382. ... 1991) The neural basis of the behaviorally relevant N1 component of the somatosensory-evoked potential in SI cortex of awake ...
Myelination of nerves is not complete in infants; therefore, neural excitabilities are lower and nerve conduction velocities ... Lee HJ, DeLisa JA: Manual of Nerve Conduction Study and Surface Anatomy for Needle Electromyography, ed 4. Philadelphia: ... Lee HJ, DeLisa JA: Manual of Nerve Conduction Study and Surface Anatomy for Needle Electromyography, ed 4. Philadelphia: ... Manual of Nerve Conduction Study and Surface Anatomy for Needle Electromyography. , ed 4. . Philadelphia. : Lippincott Williams ...
... nerve conduction and the spatio-temporal thermal gradient induced by infrared neural stimulation. Click here for listing.. ...
81301093 (to XPC). The funder had no roles in the study design, conduction of experiment, data collection and analysis, ... Neural Regeneration Research 16(3):p 591-595, March 2021. , DOI: 10.4103/1673-5374.293159 ... Thought you might appreciate this item(s) I saw in Neural Regeneration Research.. ... Thought you might appreciate this item(s) I saw in Neural Regeneration Research.. ...
Even in the case of artificial Spiking Neural Networks (SNNs), identifying applications where temporal coding outperforms the ... Even in the case of artificial Spiking Neural Networks (SNNs), identifying applications where temporal coding outperforms the ... However, conventional Artificial Neural Networks (ANNs) and machine learning algorithms cannot take advantage of this coding ... However conventional Artificial Neural Networks (ANNs) and machine learning algorithms cannot take advantage of this coding ...
Usually, nerve conduction studies and electromyography Electromyography (EMG) and Nerve Conduction Studies When determining ... they accelerate axonal transmission of neural impulses. Disorders that affect myelin interrupt nerve transmission... read more ... Nerve conduction studies and electromyography help identify level of involvement (root, plexus, peripheral nerve, neuromuscular ... The myelin sheath enhances impulse conduction. The largest and most heavily myelinated fibers conduct quickly; they convey ...
... including those of the neural crest, endo- and epicardium, fibroblasts, coronary vessels, and cardiac conduction and lymphatic ... Cardiac Neural Crest. Hiroyuki Yamagishi. Epicardium in Heart Development. Yingxi Cao, Sierra Duca, and Jingli Cao. The ... Development of the Cardiac Conduction Syste. Samadrita Bhattacharyya and Nikhil V. Munshi. Developmental Pathways of Cardiac ... and a conduction system. This structure-the heart-is the first organ to form in vertebrate embryos, and all subsequent life ...
Spike-timing and heterogenous conduction delays between neurons are crucial properties in this model. ... I work on an artificial neural network model of the cortex-hippocampus-loop in the brain. In particular, I am interested in the ...
... measurements provide information to the surgeon in the operating room that may assist in identifying neural structures, aid in ... Nerve Conduction Studies December 19 2018 Successfully Navigating the Job-Seeking Journey. larry Interest Section, Members Only ... larry Interest Section, Members Only ambulatory monitoring, clinical EEG, department managers, IONM, neonatal, Nerve Conduction ... For this article, I have been asked to give a quick explanation of what I do when I do nerve conduction studies and how I go ...
Neural Comput 17:557-608 [Journal] [PubMed]. Buia C, Tiesinga P (2006) Attentional modulation of firing rate and synchrony in a ... HODGKIN AL, HUXLEY AF (1952) A quantitative description of membrane current and its application to conduction and excitation in ... Pettersen KH, Linden H, Dale AM, Einevoll GT (2012) Extracellular spikes and current-source density Handbook of neural activity ...
... shift duration and phase lock duration for all 171 channel combinations which is a volume conduction free measure of neural ... Calculate volume conduction vs. non-volume conduction contributions to the EEG. Separate and analyse "Instantaneous ...
The encephalitis group included 3 patients with autoimmune encephalitis and antibodies against neural targets. The first ... One patient underwent a nerve conduction study, which revealed axonal motor polyneuropathy. ...
favors the Neural Efficiency Hypothesis re: IQ instead of Synaptic Density. If you search hard enough, you will find that the ... number of cortical neurons, neuron packing density, interneuronal distance and axonal conduction velocity, are all factors that ... However the Neural Efficiency Hypothesis is only a current perspective which may be misunderstood or later revised. ... but modern neuroscience thinking favors the Neural Efficiency Hypothesis re: IQ instead of Synaptic Density and in fact density ...
The clade featured superbright intelligence with neural enhancements to enhance both the speed and depth of thought processes ( ... increased nerve conduction velocity, improved memory and heightened intuition). The corpus callosum - the nerve bundle that ... More traditional means of transmitting mental data (such as via neural implants operating standard communications software) ... They vehemently opposed sophisticated neural implants, tachydidactic methods and psychoengineering. They saw the inefficient ...
Neural Control and Coordination. Neuron and nerves; peripheral and visceral nervous system; generation and conduction of nerve ...
Germanium outperforms silicon in energy efficient transistors with n- und p- conduction. Date:. February 3, 2017. Source:. ... Additionally, the realized germanium based transistors can be reconfigured between electron and hole conduction based on the ... "Germanium outperforms silicon in energy efficient transistors with n- und p- conduction." ScienceDaily. www.sciencedaily.com. / ... 2017, February 3). Germanium outperforms silicon in energy efficient transistors with n- und p- conduction. ScienceDaily. ...
Neural Conduction, Pain Measurement, Time Factors, Upper Extremity, Comparative Study, Journal Article", ... Muscle fiber conduction velocity of the upper trapezius muscle during dynamic contraction of the upper limb in patients with ... Muscle fiber conduction velocity of the upper trapezius muscle during dynamic contraction of the upper limb in patients with ... Muscle fiber conduction velocity of the upper trapezius muscle during dynamic contraction of the upper limb in patients with ...
Title: Conduction and valence band offsets of Ga2O3/h-BN heterojunction Authors: Kuang-Hui Li, Carlos G. Torres-Castanedo, ... Subjects: Atomic and Molecular Clusters (physics.atm-clus); Disordered Systems and Neural Networks (cond-mat.dis-nn); ... Title: Measuring the Gain of a Micro-Channel Plate/Phosphor Assembly Using a Convolutional Neural Network ... Title: Graph convolutional neural networks as general-purpose property predictors: the universality and limits of ...
... neural conduction; peripheral nervous system; rats; rats, sprague-dawley; treatment outcome; anesthesiology and pain medicine; ... After 6 weeks of diabetes, nerve conduction velocity (NCV) and behavioural responses to noxious mechanical and thermal stimuli ... After 6 weeks of diabetes, nerve conduction velocity (NCV) and behavioural responses to noxious mechanical and thermal stimuli ...
Neural Conduction. The propagation of the NERVE IMPULSE along the nerve away from the site of an excitation stimulus.. ... AuditoryGenetic VariationCross ReactionsEvoked PotentialsNeural ConductionEvent-Related Potentials, P300Evoked Potentials, ...
  • Nerve conduction velocity (NCV) is a test to see how fast electrical signals move through a nerve. (medlineplus.gov)
  • Being too cold alters nerve conduction and can give false results. (medlineplus.gov)
  • Often, the nerve conduction test is followed by EMG. (medlineplus.gov)
  • Nuwer MR, Pouratian N. Monitoring of neural function: electromyography, nerve conduction, and evoked potentials. (medlineplus.gov)
  • Psychometric tests, nerve conduction studies and pCASL neuroimaging assessment were performed. (iasp-pain.org)
  • The primary objective of this project is to unravel the interplay between the neurobiological signaling, nerve conduction and the spatio-temporal thermal gradient induced by infrared neural stimulation. (vanderbilt.edu)
  • The clade featured superbright intelligence with neural enhancements to enhance both the speed and depth of thought processes (increased nerve conduction velocity, improved memory and heightened intuition). (orionsarm.com)
  • After 6 weeks of diabetes, nerve conduction velocity (NCV) and behavioural responses to noxious mechanical and thermal stimuli were assessed. (unimi.it)
  • Results: Neural Prolotherapy and Platelet Rich Plasma (PRP) have improved all measured parameters like visual analogue scale (VAS), nerve conduction studies and neuromuscular ultrasonography parameters in carpal tunnel syndrome secondary to rheumatoid arthritis. (bvsalud.org)
  • With continued performance or the HRLF task for 3 months, significant declines in median nerve conduction velocity was present bilaterally in aged rats. (cdc.gov)
  • Specific chapters are devoted to various muscle and non-muscle cell lineages involved in heart development, including those of the neural crest, endo- and epicardium, fibroblasts, coronary vessels, and cardiac conduction and lymphatic systems. (cshlpress.com)
  • Schematic illustration of the cardiac conduction system. (medscape.com)
  • Aim I: To determine the extent to which exposure to two task regimens, high repetition-low force (HRLF) and low repetition-low force (LRLF) causes tissue injury, inflammation, fibrosis and degeneration in musculoskeletal and neural tissues of the upper extremity in aged rats. (cdc.gov)
  • To make a direct and principled connection between the SI waveform and underlying neural dynamics, we developed a biophysically realistic computational SI model that contained excitatory and inhibitory neurons in supragranular and infragranular layers. (jneurosci.org)
  • Information transmission in neural networks is often described in terms of the rate at which neurons emit action potentials. (frontiersin.org)
  • Spike-timing and heterogenous conduction delays between neurons are crucial properties in this model. (martinpyka.de)
  • Stoerig, 2006 ), and previous reports conflict as to the presence of neural correlates of tactile detection in primate primary somatosensory cortex (SI). (jneurosci.org)
  • We examined cortical correlates of somatosensory perception in human SI by combining MEG and computational neural modeling. (jneurosci.org)
  • To provide a framework for understanding the MEG signal and SI neural correlates of perception, we developed a realistic laminar network model. (jneurosci.org)
  • The purpose of this study was to compare average muscle fiber conduction velocity (CV) and its changes over time in the upper trapezius muscle during a repetitive upper limb task in people with chronic neck pain and in healthy controls. (birmingham.ac.uk)
  • Neural plasticity secondary to carpal tunnel syndrome: a pseudo-continuous arterial spin labeling study. (iasp-pain.org)
  • Aim of the Work: To evaluate the efficacy of Neural Prolotherapy and Platelet Rich Plasma in treatment of carpal tunnel syndrome secondary to rheumatoid arthritis. (bvsalud.org)
  • It also may provide interesting information regarding the pathways of neural signals as they navigate the nervous system. (wikipedia.org)
  • These findings strongly support the view that signatures of tactile detection are present in human SI and are mediated by local neural dynamics induced by lamina-specific synaptic drive. (jneurosci.org)
  • Quantification of phase shift duration and phase lock duration for all 171 channel combinations which is a volume conduction free measure of neural dynamics. (appliedneuroscience.com)
  • However, conventional Artificial Neural Networks (ANNs) and machine learning algorithms cannot take advantage of this coding strategy, due to their rate-based representation of signals. (frontiersin.org)
  • Even in the case of artificial Spiking Neural Networks (SNNs), identifying applications where temporal coding outperforms the rate coding strategies of ANNs is still an open challenge. (frontiersin.org)
  • I work on an artificial neural network model of the cortex-hippocampus-loop in the brain. (martinpyka.de)
  • During embryonic development, amorphous cardiac precursor cells are organized into a rhythmically contracting, multi-chambered muscular structure, complete with valves, vessels, and a conduction system. (cshlpress.com)
  • Knowing how parts of the brain are utilized may reveal more information about the structure and hierarchy used in neural development. (wikipedia.org)
  • Thought you might appreciate this item(s) I saw in Neural Regeneration Research. (lww.com)
  • Historical data is sparse but it is currently believed that these beliefs became wide spread so quickly due to the extensive use of neural implants to induce transcendental states whilst considering old texts on mystic powers. (orionsarm.com)
  • In the adult brain, both neurons and oligodendrocytes can be generated from neural stem cells located within the Sub-Ventricular Zone (SVZ). (elifesciences.org)
  • Afferent neural signals originating in the myocardium and the lung are 'processed' at various levels of the neuroaxis - intrinsic cardiac neurons (the 'little brain' of the heart), lung afferents, extracardiac-intrathoracic ganglia (stellate ganglia), spinal cord, brain stem, and higher centers, and are required for the fine efferent cardiomotor and airway control via the sympathetic and parasympathetic nerves. (nih.gov)
  • Ancient evolutionary origin of vertebrate enteric neurons from trunk-derived neural crest. (fish-evol.org)
  • SNNAP -- Simulator for Neural Networks and Action Potentials is a tool for rapid development and simulation of realistic models of single neurons and neural networks. (modeldb.science)
  • Oligodendrocytes regulate myelin and may affect action potential conduction, neuronal spike timing, and behaviorally relevant oscillations. (nih.gov)
  • Mechanism of Action Lidocaine HCl stabilizes the neuronal membrane by inhibiting the ionic fluxes required for the initiation and conduction of impulses thereby effecting local anesthetic action. (nih.gov)
  • Temporal coding in neuronal populations in the presence of significant electrotonic dendritic conduction times. (york.ac.uk)
  • Migratory neuronal progenitors arise from the neural plate borders in tunicates. (fish-evol.org)
  • Nerve conduction velocity (NCV) is a test to see how fast electrical signals move through a nerve. (medlineplus.gov)
  • To understand persistence of vibration injury, the present study examined recovery of nerve conduction velocity and structural damage of myelinated axons in a rat tail vibration model. (cdc.gov)
  • Nerve section is followed by a reduction of motor and sensory conduction velocity in the proximal segment of the injured nerve. (nih.gov)
  • It consists of the retina which is a neural and sensory layer of an eyeball. (oswalpublishers.com)
  • Nuwer MR, Pouratian N. Monitoring of neural function: electromyography, nerve conduction, and evoked potentials. (medlineplus.gov)
  • Electromyography (EMG) and nerve conduction studies (NCS) should be performed. (medscape.com)
  • Schematic illustration of the cardiac conduction system. (medscape.com)
  • During embryonic development, amorphous cardiac precursor cells are organized into a rhythmically contracting, multi-chambered muscular structure, complete with valves, vessels, and a conduction system. (cshlpress.com)
  • Specific chapters are devoted to various muscle and non-muscle cell lineages involved in heart development, including those of the neural crest, endo- and epicardium, fibroblasts, coronary vessels, and cardiac conduction and lymphatic systems. (cshlpress.com)
  • The nervous system modulates almost all known physiological aspects of cardiac organ physiology (i.e., heart rate, heart rhythm/signal conduction, contraction, relaxation, sensations, and response to injury). (nih.gov)
  • The pathologic sequence begins with short-term adaptations to cardiac injury followed by a profound maladaptation eventually resulting in adverse outcomes, including structural and functional remodeling of the neural structures that control the heart. (nih.gov)
  • Workshop participants summarized the current state of knowledge in the basic and clinical sciences related to neural control of cardiac and lung physiology and pathophysiology. (nih.gov)
  • 1998. Effects of heat stress on axonal conduction in the locust flight system. (usask.ca)
  • In addition, a growing number of studies show that the axon trunk can express receptors to glutamate, GABA, acetylcholine or biogenic amines, changing the relative contribution of some channels to axonal excitability and therefore rendering the contribution of this compartment to neural coding conditional on the presence of neuromodulators. (njit.edu)
  • 2019) Neural conduction, visual motion detection, and insect flight behaviour are disrupted by low doses of imidacloprid and its metabolites. (usask.ca)
  • Dynamic Brain - from Neural Spikes to Behaviors. (edu.au)
  • Nerve conduction studies localised abnormalities to the most proximal and distal nerve segments. (elsevierpure.com)
  • 1952). A quantitative description of membrane current and its application to conduction and excitation in nerve. (modeldb.science)
  • dblp: A Combined Data-driven and Physics-driven Method for Steady Heat Conduction Prediction using Deep Convolutional Neural Networks. (uni-trier.de)
  • This article addresses the use of boundary element method in conjunction with minimal energy technique for solving a geometrical inverse heat conduction problem. (asme.org)
  • Martin , T. J. , and Dulikravich , G. S. , 1996 , " Inverse Determination of Boundary Conditions and Sources in Steady Heat Conduction with Heat Generation ," ASME J. Heat Transfer , 118 , pp. (asme.org)
  • Spike train analysis for neural systems. (york.ac.uk)
  • The complex time- and voltage-dependence resulting from the properties of ion channels can lead to activity-dependent changes in spike shape and resting potential, affecting the temporal fidelity of spike conduction. (njit.edu)
  • Finally, microglia prune synapses in an activity-dependent manner that may alter behaviorally activated neural networks over long time scales. (nih.gov)
  • After demyelination, oligodendrocytes derived from these newly-formed progenitors provide functional remyelination, restoring normal conduction. (elifesciences.org)
  • o (neural crest) ƃv R [ h ( \ �� �� ) ́C Ғœ ��t ɐV i ��זE ł (Bae et al. (fish-evol.org)
  • Shared evolutionary origin of vertebrate neural crest and cranial placodes. (fish-evol.org)
  • Neural crest cell evolution: how and when did a neural crest cell become a neural crest cell. (fish-evol.org)
  • Establishing neural crest identity: a gene regulatory recipe. (fish-evol.org)
  • The lamprey: a jawless vertebrate model system for examining origin of the neural crest and other vertebrate traits. (fish-evol.org)
  • Gene duplications and the early evolution of neural crest development. (fish-evol.org)
  • Incremental evolution of the neural crest, neural crest cells and neural crest-derived skeletal tissues. (fish-evol.org)
  • Evoked muscle potentials and motor fiber conduction rate in the diagnosis of median and ulnar nerve injuries]. (nih.gov)
  • The program builds on the scientific foundation of peripheral neural control of organ function to create and advance the next generation of therapeutic neuromodulation devices and protocols. (nih.gov)
  • Lidocaine Hydrochloride and Epinephrine Injection, USP is indicated for production of local or regional anesthesia by infiltration techniques such as percutaneous injection, by peripheral nerve block techniques such as brachial plexus and intercostal and by central neural techniques such as lumbar and caudal epidural blocks, when the accepted procedures for these techniques as described in standard textbooks are observed. (nih.gov)
  • While neural dysfunction is known to contribute to psychiatric disorders, glial disruptions have also been implicated. (nih.gov)
  • Identify approaches to further develop predictive markers of ANS dysfunction and to precisely target these mechanisms with neural-based antiarrhythmic, heart failure, pulmonary, and sleep disorders therapies, including novel approaches to both subclinical and clinical heart failure and arrhythmia prevention. (nih.gov)
  • It also may provide interesting information regarding the pathways of neural signals as they navigate the nervous system. (wikipedia.org)
  • The National Heart, Lung, and Blood Institute (NHLBI), in partnership with the National Institutes of Health (NIH) Office of the Director (OD), convened a workshop on "Autonomic Neural Mechanisms of Cardiopulmonary Regulation. (nih.gov)
  • Neurobiological mechanisms acting as mediators are also potentially responsible for intervention-induced behavioral change (e.g., changes in pattern of neural activation, connectivity, default state, conduction efficiency). (nih.gov)
  • Knowing how parts of the brain are utilized may reveal more information about the structure and hierarchy used in neural development. (wikipedia.org)
  • Modern techniques have evolved to focus on a few biological characteristics: Brain ERPs, brain size, and speed of neural conduction. (wikipedia.org)
  • 1994). Simulator for neural networks and action potentials: description and application. (modeldb.science)
  • At 50mmhg tissue permeability increases with an influx of oedema, higher than 75mmhg, there is nerve conduction failure if sustained for 2 hours. (physio-pedia.com)
  • Our intracranial-EEG results further point to enhanced functional connectivity between decision-making- and motor planning aspects of the PFC, as a possible neural mechanism for internally generated action planning. (frontiersin.org)
  • Neural circuitry and control of the cardiopulmonary systems are central to life, with profound physiological linking and interplay. (nih.gov)
  • 39. Retinal function and neural conduction along the visual pathways in affected and unaffected carriers with Leber's hereditary optic neuropathy. (nih.gov)
  • In addition, a morphological impairment of RNFL associated with an abnormal neural conduction along the visual pathways can be also detected. (curefa.org)
  • Femoral nerve motor conduction studies may show asymmetrical amplitudes, and paraspinal muscle needle EMG may show fibrillations and positive sharp waves, but the results are usually within the reference range. (medscape.com)
  • Supports oxidative phosphorylation (aerobic energy metabolism), cell growth, optimum neural conduction (nerve impulses), and cardiovascular health. (concordia.style)