Delta Rhythm
The effects of leptin on REM sleep and slow wave delta in rats are reversed by food deprivation. (1/156)
Leptin (ob protein) is an adipose tissue derived circulating hormone that acts at specific receptors in the hypothalamus to reduce food intake. The protein is also critically involved in energy balance and metabolic status. Here the effect of leptin on sleep architecture in rats was evaluated because food consumption and metabolic status are known to influence sleep. Sprague-Dawley rats were chronically implanted with electrodes for EEG and EMG recording and diurnal sleep parameters were quantified over 9-h periods following leptin administration. Murine recombinant leptin (rMuLep) was administered systemically to rats that either had undergone 18 h of prior food deprivation or had received food ad libitum. In the normally fed rats, leptin significantly decreased the duration of rapid eye movement sleep (REMS) by about 30% and increased the duration of slow wave sleep (SWS) by about 13%, the latter effect reflecting enhanced power in the delta frequency band. These results are consistent with studies that have linked changes in metabolic rate with effects on sleep. Leptin administration has previously been shown to alter neuroendocrine parameters that could have mediated these changes in sleep architecture. Unexpectedly, prior food deprivation negated the effect of leptin on both REMS and SWS, a result that emphasizes the significance of the apparent coupling between sleep parameters and energy status. (+info)Increased gamma- and decreased delta-oscillations in a mouse deficient for a potassium channel expressed in fast-spiking interneurons. (2/156)
Kv3.1 is a voltage-gated, fast activating/deactivating potassium (K(+)) channel with a high-threshold of activation and a large unit conductance. Kv3.1 K(+) channels are expressed in fast-spiking, parvalbumin-containing interneurons in cortex, hippocampus, striatum, the thalamic reticular nucleus (TRN), and in several nuclei of the brain stem. A high density of Kv3.1 channels contributes to short-duration action potentials, fast afterhyperpolarizations, and brief refractory periods enhancing the capability in these neurons for high-frequency firing. Kv3.1 K(+) channel expression in the TRN and cortex also suggests a role in thalamocortical and cortical function. Here we show that fast gamma and slow delta oscillations recorded from the somatomotor cortex are altered in the freely behaving Kv3.1 mutant mouse. Electroencephalographic (EEG) recordings from homozygous Kv3.1(-/-) mice show a three- to fourfold increase in both absolute and relative spectral power in the gamma frequency range (20-60 Hz). In contrast, Kv3.1-deficient mice have a 20-50% reduction of power in the slow delta range (2-3 Hz). The increase in gamma power is most prominent during waking in the 40- to 55-Hz range, whereas the decrease in delta power occurs equally across all states of arousal. Our findings suggest that Kv3. 1-expressing neurons are involved in the generation and maintenance of cortical fast gamma and slow delta oscillations. Hence the Kv3. 1-mutant mouse could serve as a model to study the generation and maintenance of fast gamma and slow delta rhythms and their involvement in behavior and cognition. (+info)The transcription factor DBP affects circadian sleep consolidation and rhythmic EEG activity. (3/156)
Albumin D-binding protein (DBP) is a PAR leucine zipper transcription factor that is expressed according to a robust circadian rhythm in the suprachiasmatic nuclei, harboring the circadian master clock, and in most peripheral tissues. Mice lacking DBP display a shorter circadian period in locomotor activity and are less active. Thus, although DBP is not essential for circadian rhythm generation, it does modulate important clock outputs. We studied the role of DBP in the circadian and homeostatic aspects of sleep regulation by comparing DBP deficient mice (dbp-/-) with their isogenic controls (dbp+/+) under light-dark (LD) and constant-dark (DD) baseline conditions, as well as after sleep loss. Whereas total sleep duration was similar in both genotypes, the amplitude of the circadian modulation of sleep time, as well as the consolidation of sleep episodes, was reduced in dbp-/- under both LD and DD conditions. Quantitative EEG analysis demonstrated a marked reduction in the amplitude of the sleep-wake-dependent changes in slow-wave sleep delta power and an increase in hippocampal theta peak frequency in dbp-/- mice. The sleep deprivation-induced compensatory rebound of EEG delta power was similar in both genotypes. In contrast, the rebound in paradoxical sleep was significant in dbp+/+ mice only. It is concluded that the transcriptional regulatory protein DBP modulates circadian and homeostatic aspects of sleep regulation. (+info)Investigation of nonlinear ECoG changes during spontaneous sleep state changes and cortical arousal in fetal sheep. (4/156)
We examined the processes of cortical activation and deactivation of the fetal brain during spontaneous sleep state transitions and during central nervous processing of vibroacoustic stimulations (VASs) using nonlinear analysis of the electrocorticogram (ECoG). Tests of nonlinearity and a random shuffling routine revealed deterministic and nonlinear portions in the fetal ECoG. As common nonlinear measures are not applicable to nonstationary time series, we developed an algorithm to estimate the predictability of the ECoG in its time course by means of a point prediction error (PPE). The ECoG was recorded before and during VAS from the maternal abdominal surface in seven chronically instrumented fetal sheep at 0.8 of gestation. The PPE during REM sleep was significantly higher than during NREM sleep. VAS in NREM sleep resulted in an abrupt increase of the PPE not reaching the level of REM sleep. The steep increase of the PPE at onset and its slow decrease after cessation of the stimulus were very similar to the dynamics of spontaneous sleep state transitions, suggesting the involvement of the same cortical activating mechanisms. In conclusion, the stage and the time course of fetal brain activation and deactivation patterns can be clearly shown by PPE techniques. The PPE is a useful complement to spectral analysis. Both techniques describe different properties of the ECoG. (+info)Effect of lesions of the ventrolateral preoptic nucleus on NREM and REM sleep. (5/156)
Neurons in the ventrolateral preoptic nucleus (VLPO) in rats show c-fos activation after sleep and provide GABAergic innervation of the major monoamine arousal systems, suggesting that they may be a necessary part of the brain circuitry that produces sleep. We examined the effects on sleep behavior in rats of cell-specific damage to the VLPO by microinjection of ibotenic acid. Severe lesions of the central cell cluster of the VLPO ( approximately 80-90% cell loss bilaterally) caused a 60-70% decrease in delta power and a 50-60% decrease in nonrapid-eye-movement (NREM) sleep time (p < 0.001). The number of remaining Fos-immunoreactive neurons in the VLPO cell cluster was linearly related to NREM sleep time (r = 0.77; p < 0.001) and total electroencephalogram delta power (r = 0. 79; p < 0.001) but not to rapid-eye-movement (REM) sleep (r = 0.35; p > 0.10). Lesions in the region containing scattered VLPO neurons medial or dorsal to the cell cluster caused smaller changes in NREM sleep time (24.5 or 15%, respectively) but were more closely associated with loss of REM sleep (r = 0.74; p < 0.01). The insomnia caused by bilateral VLPO lesions persisted for at least 3 weeks. Lesions of the VLPO caused no change in mean body temperature or its circadian variation; after small lesions of the ventromedial preoptic nucleus, body temperature showed normal circadian variation but a wider temperature range, and sleep behavior was not affected. These experiments delineate distinct preoptic sites with primary effects on the regulation of NREM sleep, REM sleep, and body temperature. (+info)Successful radiofrequency catheter ablation of incessant ventricular tachycardia with a delta wave-like beginning of the QRS complex. (6/156)
Ventricular tachycardia with a delta wave-like beginning of the QRS complex is considered to be refractory to endocardial catheter ablation because it originates from the epicardial region. A 45-year-old woman had incessant ventricular tachycardia with a delta wave-like beginning of the QRS complex which was resistant to several antiarrhythmic drugs. The origin of the arrhythmia was at the mitral annulus on the antero-lateral left ventricular wall. The earliest endocardial activation preceded the QRS complex by 18 msec. After 7 sec of endocardial radiofrequency application ventricular tachycardia was terminated. During a 2 year follow-up ventricular tachycardia did not recur and only small numbers of premature ventricular contractions (< 100/day) were noted. VT with delta wave-like QRS morphology which originates from the basal region of the ventricle may be treated successfully with radiofrequency catheter ablation using an endocardial approach. (+info)Effects of bilateral microinjections of ibotenic acid in the thalamic reticular nucleus on delta oscillations and sleep in freely-moving rats. (7/156)
The thalamic reticular nucleus (NRT) consists of a large pool of GABAergic neurons located on each side on the anterior, lateral, and ventral surfaces of the dorsal thalamus. The NRT is divided up into sectors. The aim of this study was to investigate the effects of bilateral lesions of the NRT on sleep and sleep oscillations. Only the results concerning delta oscillations will be reported here. As a first step we produced stereotaxically placed electrolytic lesions. The rats presented continuous circling behavior with electroencephalographic (EEG) theta and delta activity and subsequent sudden death. To avoid disruption of the bundles of fibers that pass through the NRT to and from the cerebral cortex, we used the excitotoxic ibotenic acid. Given its high toxicity, we concentrated on the rostral pole of the NRT, which is believed to have powerful effects on the synchronization of oscillatory activity during sleep. Immediately after surgery, the rats fell into a deep sleep during which there was an increase in EEG slow-wave activity and no spindles. On postoperative day 2, corresponding to the destruction period, the sleep/wake cycle partially recovered, but NREM sleep was quantitatively diminished and showed abnormalities (increased latency to sleep onset, sleep fragmentation, gradual elimination of the delta rhythm). It is concluded that the rostral pole of the NRT contributes to normal and pathological EEG synchronization and the organization of sleep in rats. (+info)The homeostatic regulation of sleep need is under genetic control. (8/156)
Delta power, a measure of EEG activity in the 1-4 Hz range, in slow-wave sleep (SWS) is in a quantitative and predictive relationship with prior wakefulness. Thus, sleep loss evokes a proportional increase in delta power, and excess sleep a decrease. Therefore, delta power is thought to reflect SWS need and its underlying homeostatically regulated recovery process. The neurophysiological substrate of this process is unknown and forward genetics might help elucidate the nature of what is depleted during wakefulness and recovered during SWS. We applied a mathematical method that quantifies the relationship between the sleep-wake distribution and delta power to sleep data of six inbred mouse strains. The results demonstrated that the rate at which SWS need accumulated varied greatly with genotype. This conclusion was confirmed in a "dose-response" study of sleep loss and changes in delta power; delta power strongly depended on both the duration of prior wakefulness and genotype. We followed the segregation of the rebound of delta power after sleep deprivation in 25 BXD recombinant inbred strains by quantitative trait loci (QTL) analysis. One "significant" QTL was identified on chromosome 13 that accounted for 49% of the genetic variance in this trait. Interestingly, the rate at which SWS need decreases did not vary with genotype in any of the 31 inbred strains studied. These results demonstrate, for the first time, that the increase of SWS need is under a strong genetic control, and they provide a basis for identifying genes underlying SWS homeostasis. (+info)A "delta rhythm" is a term used in electroencephalography (EEG) to describe a pattern of brain waves that are typically seen in the delta frequency range (0.5-4 Hz) and are maximal over the posterior regions of the head. This rhythm is often observed during deep sleep stages, specifically stage 3 and stage 4 of non-rapid eye movement (NREM) sleep, also known as slow-wave sleep.
Delta waves are characterized by their high amplitude and slow frequency, making them easily distinguishable from other brain wave patterns. The presence of a robust delta rhythm during sleep is thought to reflect the restorative processes that occur during this stage of sleep, including memory consolidation and physical restoration.
However, it's important to note that abnormal delta rhythms can also be observed in certain neurological conditions, such as epilepsy or encephalopathy, where they may indicate underlying brain dysfunction or injury. In these cases, the presence of delta rhythm may have different clinical implications and require further evaluation by a medical professional.
A circadian rhythm is a roughly 24-hour biological cycle that regulates various physiological and behavioral processes in living organisms. It is driven by the body's internal clock, which is primarily located in the suprachiasmatic nucleus (SCN) of the hypothalamus in the brain.
The circadian rhythm controls many aspects of human physiology, including sleep-wake cycles, hormone secretion, body temperature, and metabolism. It helps to synchronize these processes with the external environment, particularly the day-night cycle caused by the rotation of the Earth.
Disruptions to the circadian rhythm can have negative effects on health, leading to conditions such as insomnia, sleep disorders, depression, bipolar disorder, and even increased risk of chronic diseases like cancer, diabetes, and cardiovascular disease. Factors that can disrupt the circadian rhythm include shift work, jet lag, irregular sleep schedules, and exposure to artificial light at night.
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Theta7
- This study demonstrates that cue-evoked midfrontal delta/theta signals were directly related to cognition in patients with Parkinson's disease . (medscape.com)
- Time-frequency analyses were used to evaluate midfrontal delta/theta rhythms. (medscape.com)
- Emphasis was placed on cue-evoked delta (1-4 Hz) and theta (4-7 Hz) rhythms from a single midfrontal EEG electrode (Cz). (medscape.com)
- There was scattered and slowing of the alpha rhythm with subsequent appearance of theta and delta activity. (ispub.com)
- Individual EEG rhythms of interest were delta (about 2-4 Hz), theta (about 4-6 Hz), alpha 1 (about 6-8 Hz), alpha 2 (about 8-10 Hz) and alpha 3 (about 10-12 Hz). (twoday.net)
- Monaural Beats for Theta Rhythm (100Hz and 105Hz) to be the meditative state or focusing the mind. (accel-brain.com)
- Beat Type Monaural Beats Frequencies Left: 100Hz Right: 105Hz Brain Wave: 5Hz (Theta rhythm) Effects To be the meditative state or focusing the mind. (accel-brain.com)
Circadian rhythms2
- RESULTS: All subjects completed two sessions while potential confounding variables such as hydration, circadian rhythms, etc were carefully controlled to be as identical as possible. (cdc.gov)
- The gene produces an enzyme that's important for brain signaling and for regulating our circadian rhythms. (nih.gov)
Rogers3
- 7:50am Shake Your Moneymaker by Roy Rogers & The Delta Rhythm Kings on Live! (kzfr.org)
- Also appearing Ray Manzarek, Carlos Reyes and Roy Rogers & The Delta Rhythm Kings. (ramblinjack.com)
- Headlining the festival this year will be performers Gary Clark Jr., Trombone Shorty & Orleans Avenue, Boney James & Larry Graham & Graham Central Station along with Goapele, Jon Batiste & Stay Human, Ana Popovic, Roy Rogers & The Delta Rhythm Kings, Beso Negro, Davina & The Vagabonds, and Mitch Woods. (bluesfestivalguide.com)
Physiological2
- We tested the working hypothesis that electromagnetic fields from mobile phones (EMFs) affect interhemispheric synchronization of cerebral rhythms, an important physiological feature of information transfer into the brain. (twoday.net)
- Here we demonstrate that physiological delta frequency rhythms act as an effective substrate to permit modelling of SpW of cortical origin and may help to address this issue. (yale.edu)
Cardioversion1
- Electrical cardioversion is the most effective method for restoring sinus rhythm. (medscape.com)
Primary visual1
- The discovery of three different types of narrowband gamma rhythm in primary visual cortex (V1), first reported by Han et al. (frontiersin.org)
Boys3
- The Delta Rhythm Boys was an American vocal group active from 1934 to 1987. (wikipedia.org)
- 2004. The Delta Rhythm Boys at the Vocal Group Hall of Fame website The Delta Rhythm Boys at Doo Wop Nation Jason Gross. (wikipedia.org)
- The Delta Rhythm Boys perform two songs. (max.com)
Sinus rhythm2
- In classic (or manifest) WPW syndrome, antegrade conduction occurs over both the accessory pathway and the normal conducting system during sinus rhythm. (msdmanuals.com)
- If the patient is stable, vagal maneuvers can be used to slow the heart rate and to convert to sinus rhythm. (medscape.com)
Frequency1
- The study provides insight into the nature of low-frequency rhythms that could be used to predict cognitive dysfunction in Parkinson's disease. (medscape.com)
Beats6
- Monaural Beats for Alpha Rhythm (500Hz and 508Hz) to be Relaxed State. (accel-brain.com)
- Monaural Beats for Delta Rhythm (400Hz and 403Hz) to have a Good Sleep. (accel-brain.com)
- Beat Type Monaural Beats Frequencies Left: 400Hz Right: 403Hz Brain Wave: 3Hz (Delta rhythm) Effects To have a good sleep. (accel-brain.com)
- Beat Type Binaural Beats Frequencies Left: 500Hz Right: 508Hz Brain Wave: 8Hz (Alpha rhythm) Effects To be relaxed state. (accel-brain.com)
- Binaural Beats for Delta Rhythm (300Hz and 303Hz) to have a Good Sleep. (accel-brain.com)
- Atrial premature beats Various rhythms result from supraventricular foci (usually in the atria). (msdmanuals.com)
Adenosine1
- If these maneuvers are ineffective, treatment is with IV adenosine or nondihydropyridine calcium channel blockers for narrow QRS rhythms or for wide QRS rhythms known to be a reentrant SVT with aberrant conduction that requires atrioventricular nodal conduction. (msdmanuals.com)
Mississippi Delta4
- JACKSON, Miss. - A small town in the Mississippi Delta that has ties to the civil rights movement will soon be home to the National Rhythm and Blues Hall of Fame. (ksfr.org)
- The conditions in the cotton fields of Quitman County and other parts of the Mississippi Delta were the environment in which early civil rights activists and field workers produced music that's now identified as blues, gospel and R&B, project planners said. (ksfr.org)
- Attend a Privileged Access Mississippi Delta blues experience in Greenville and be inspired by the stories of famed musicians and iconic civil rights heroes. (vikingrivercruises.co.uk)
- Immerse yourself in the blues with Viking's Privileged Access Mississippi Delta experience. (vikingrivercruises.co.uk)
20222
Portuguese1
- Sun Y, Zhang C. Task effect on L2 rhythm production by Cantonese learners of Portuguese . (ncl.ac.uk)
Band5
- The Deltas were a Shrewsbury band with a strong local following and were one of the supporting acts for The Beatles, who topped the bill. (shropshirestar.com)
- or pretending to be less of a modernist than he was, like Muddy Waters, who had the first all-electric band in Chicago in the late 1940s but impersonated the acoustic Delta soloists of his childhood for student audiences in the 1960s. (freebeacon.com)
- Mekong Delta is normally a very left field band with tonnes of strange beyond belief rhythm structures and melodies. (progarchives.com)
- T he Legendary Rhythm and Blues Revue is a collection of gifted musicians who can be best described as a blues jam band. (turbula.net)
- Furthermore, the observed AS EEG phenotype of excess delta-band power was consistent with prior reports. (bvsalud.org)
Gene1
- The researchers hunted for the cause of the sleep cycle disorder and discovered a mutation in the casein kinase I delta (CKIδ) gene. (nih.gov)
Brain4
- Groups of neurons in the brain continuously cycle in unison between periods of heightened and suppressed electrical activity that neuroscientists call 'oscillations' or 'rhythms. (nih.gov)
- IRP senior investigator Leonardo Cohen, M.D. , is more interested in what the brain is doing when it is awake, particularly a cycling of neuronal activity called the 'mu rhythm' that can be seen in brain regions responsible for sensory perception and movement, like the primary motor cortex. (nih.gov)
- What's more, he believes that studying this neuronal rhythm can potentially boost the effects of brain stimulation approaches like TMS, which uses magnetic fields to generate electrical currents in the brain. (nih.gov)
- One group received TMS delivered to the primary motor cortex that was precisely timed to stimulate their brains only during the 'trough' phases of the mu rhythm, while a second group received TMS stimulation to the same brain region only during the 'peak' phases of the mu rhythm. (nih.gov)
Blues9
- By 1950, Rhythm and Blues was well established as a distinct form of black popular music having shed the generic racial connotations of earlier descriptions. (rhythmandbluesrecords.co.uk)
- And stir your soul with the rhythms of Dixieland jazz, Delta blues and gospel. (vikingrivercruises.co.uk)
- From the Delta to the electrified blues of Chicago, then across the Atlantic to the blues inspired rock of the Stones, Zeppelin and Free before making their way back home through the Texas roadhouses. (bluesbunny.com)
- With "Slow Train Drag" for example they perfectly capture the rhythms and sounds of the Delta with a full blown slow paced blues number. (bluesbunny.com)
- Three of these were in Black music: Delta blues, jump blues and rhythm and blues. (blogspot.com)
- In 1961, Columbia Records reissued 16 of Johnson's tracks and posthumously crowned him the "King of the Delta Blues Singers. (freebeacon.com)
- Johnson as the first and future king, not just of the Delta blues but of all blues, and by extension the later styles which drew on it, especially '60s rock. (freebeacon.com)
- John Hammond, who issued the King of the Delta Blues Singers album in 1961, had booked Johnson to appear at the "From Spirituals to Swing" concert at Carnegie Hall in December 1938. (freebeacon.com)
- The Metrotones had to be versatile enough to change their sound depending on who they were backing, from grooving slow-burners like Alvin Cash's "Twine Time" or the Delta-by-way-of--Chicago blues of Little Milton's "Blind Man. (washingtoncitypaper.com)
Activity2
- Delta Rhythm Orchestrates the Neural Activity Underlying the Resting State BOLD Signal via Phase–amplitude Coupling. (nih.gov)
- The present results suggest that prolonged mobile phone emission affects not only the cortical activity but also the spread of neural synchronization conveyed by interhemispherical functional coupling of EEG rhythms. (twoday.net)
Effective1
- Procainamide or amiodarone are effective for other wide QRS rhythms. (msdmanuals.com)
Times1
- During deep sleep, for example, neurons in the brain's cortex switch between electrical highs and lows roughly one to four times per second, a phenomenon called the 'delta rhythm. (nih.gov)
Songs1
- Second, it can be used to help enhance attention to "boring" academic tasks such as memorization, using songs, rhythms, and dance or movement to enhance the interest of the lists to be memorized. (healthychildren.org)
Soul1
- Soul Monster / Delta Groove Music, Inc. (stanford.edu)
Full1
- It was supposed to be a relaxing trip: a holiday weekend sail into the Sacramento-San Joaquin Delta, full of pleasant dips in fresh water, relaxing sunsets, and warm breezes. (berkeleyyc.org)
Music3
- David Wiseman, bass guitarist with The Deltas, didn't think that much of the Liverpool foursome on the bill with them at the Music Hall in Shrewsbury on December 14, 1962. (shropshirestar.com)
- The Deltas on stage at the Music Hall on December 14, 1962. (shropshirestar.com)
- Scientific research supports common experience that pairing music with rhythm and pitch enhances learning and recall. (healthychildren.org)
Strong1
- Usually, a trip up into the delta begins with a strong following breeze, taking you swiftly to your destination, current-gods willing. (berkeleyyc.org)
Left1
- The Deltas during the concert, with Roger third from left in the group line-up. (shropshirestar.com)
Good1
- We had finally found a steady upwind rhythm at this point, tacking regularly but making good progress. (berkeleyyc.org)
Power2
- Parkinson's disease-related cognitive dysfunction was associated with increased response time latencies and decreased midfrontal delta power across the Simon, oddball, and interval timing tasks. (medscape.com)
- In both Angelman syndrome and Rett syndrome, increased delta power on spectral analysis has correlated with clinical markers of disease severity including developmental disability and seizure burden, whereas spectral power analysis on EEG in fragile X syndrome tends to demonstrate abnormalities in gamma power. (bvsalud.org)
Calendar1
- This presentation of microscopic images in the Phytoplankton calendar illustrates the yearly rhythm of phytoplankton in the Marsdiep, the 'backyard' of the Royal NIOZ. (nioz.nl)
Heart1
- Cruise Heart of the Delta Immerse yourself in history and heritage on this journey bookended by New Orleans and Memphis. (vikingrivercruises.co.uk)