Early gamma response of sleep is sensory/perceptual in origin

Karakaş, Sirel; Arıkan, Orhan; Çakmak, Emine D.; Bekçi, Belma; Doğutepe, Elvin; Tüfekçi, İlhan

doi:10.1016/j.ijpsycho.2006.03.005

Cited by 10 publications

(5 citation statements)

References 46 publications

(65 reference statements)

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“…These findings suggest that in sleep, N1 and the specific delta/theta superposition that contributes to it may functionally be representing early stimulus processing or sensory processing. This conclusion was supported by a recent study 39 where the early time‐locked gamma response, which represents sensory‐perceptual processing, was observed in REM and all stages of NREM sleep.…”

Section: Discussionsupporting

confidence: 78%

Information processing in sleep based on event-related activities of the brain

et al. 2007

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The study investigates information processing operations in rapid eye movement (REM) sleep and stages of non-REM sleep. An eclectic approach was used in the study whereby the effect of external auditory stimuli was investigated on both the peaks in the event-related potentials (ERP) waveform and on the oscillatory responses that contribute to the morphology of this waveform. Data on overnight sleep were acquired from 12 healthy, young adult, volunteer men; those on the awake stage were obtained from 21 matched men. Brain activity was obtained in response to auditory stimuli (2000 Hz deviant and 1000 Hz standard stimuli: 65 dB, 10 msec r/f time, 50 msec duration) under the passive oddball paradigm in sleep and the active and passive oddball paradigms in wakefulness. The effect of the experimental variables (stimulus type, sleep stage) on ERP peak amplitudes was studied through analysis of variance for repeated measures. The contribution of the oscillatory responses to the ERP peaks was studied using stepwise multiple regression. As represented with the amplitude of the ERP peaks and the oscillatory responses, auditory information processing selectively varied in different stages of sleep. Processing took longer in sleep: comparable peaks were obtained at longer latencies and later components appeared that did not exist in wakefulness. With a long-duration theta activity and greater differentiation between the deviant-and standard-elicited stimuli, Stage 2 appeared to represent effortful cognitive processing. As represented with only the earlier peaks and the insignificant delta activity, REM represented less extended cognitive processing.

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Section: Discussionsupporting

confidence: 78%

Information processing in sleep based on event-related activities of the brain

et al. 2007

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“…Gamma activity has been linked to attention (Fries et al, 2001) and memory (encoding and retrieving; Montgomery and Buzsáki, 2007), which are waking functions. In ERP studies, an early gamma response to stimuli is generated in REM and NREM sleep and is thought to be sensory/perceptual processing (Karakaş et al, 2006). Gamma activity in Para-I is then localized in the opposite hemisphere compared with GS.…”

Section: Discussionmentioning

confidence: 99%

Cerebral Asymmetry in Insomnia Sufferers

St-Jean¹,

Turcotte²,

Bastien³

2012

Front. Neur.

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Cerebral asymmetry is used to describe the differences in electroencephalographic activity between regions of the brain. The objective of this study was to document frontal, central, and parietal asymmetry in psychophysiological (Psy-I) and paradoxical (Para-I) insomnia sufferers as well as good sleeper (GS) controls, and to compare their patterns of asymmetry to others already found in anxiety and depression. Additionally, asymmetry variations between nights were assessed. Participants were 17 Psy-I, 14 Para-I, and 19 GS (mean age = 40 years, SD = 9.4). They completed three nights of polysomnography (PSG) recordings following a clinical evaluation in a sleep laboratory. All sleep cycles of Nights 2 and 3 were retained for power spectral analysis. The absolute activity in frequency bands (0.00–125.00 Hz) was computed at multiple frontal, central, and parietal sites in rapid eye movement and non-rapid eye movement sleep to provide cerebral asymmetry measures. Mixed model ANOVAs were computed to assess differences between groups and nights. Correlations were performed with asymmetry and symptoms of depression and anxiety from self-reported questionnaires. Over the course of the two nights, Para-I tended to present hypoactivation of their left frontal region but hyperactivation of their right one compared with GS. As for Psy-I, they presented increased activation of their right parietal region compared with Para-I. Asymmetry at frontal, central, and parietal region differed between nights. On a more disrupted night of sleep, Psy-I had increased activity in their right parietal region while Para-I presented a decrease in cerebral activity in the right central region on their less disrupted night of sleep. Anxious and depressive symptoms did not correlate with asymmetry at any region. Therefore, Psy-I and Para-I present unique patterns of cerebral asymmetry that do not relate to depression or anxiety, and asymmetry varies between nights, maybe as a consequence of variability in objective sleep quality from night to night.

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“…Recently, electrophysiological oscillatory results in the sleep environment have been presented 11–14 . The findings include the role of gamma oscillatory activity in sensory/perceptual processing and with respect to long‐duration theta activity, differentiation between the deviant‐ and standard‐elicited stimuli in sleep information processing.…”

Section: Introductionmentioning

confidence: 99%

Analysis of non-REM sleep staging with electroencephalography bispectral index

Özgören

Kocaaslan

Öniz

2008

Sleep and Biological Rhythms

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The present study provides results in an early sleep period for non-REM stage correlation with bispectral index (BIS) values. The purpose of the study was to assess the applicability of an objective procedure to monitor sleep. Nine healthy subjects (mean age: 25.0 Ϯ 4.4; 1 female) were recruited for the study without history of any neurological, psychiatric, or sleep-related disorders. Electroencephalography (EEG) signals from 30 electrodes referenced to linked earlobe electrodes, and electrooculography (EOG) and electromyography (EMG) activities were recorded. BIS recording was performed simultaneously with EEG recording. Because that the current study is related to non-REM sleep, corresponding to the first sleep cycle, approximately 90 min of data was processed both for BIS and EEG data pools. The sleep staging was done using traditional Rechtschaffen and Kales scoring (R&K) and BIS scores were acquired online. The BIS values corresponded well to sleep depth, decreasing in accordance with sleep stages. Overall BIS correlation with sleep scores in the non-REM was found to be r = 0.86 (Spearman analysis, n = 9, r 2 = 0.75). Accompanying the traditional scoring, BIS and BIS-like tools can be useful for information processing and for psychophysiological applications in neurology, psychiatry, and further studies on consciousness.

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Early gamma response of sleep is sensory/perceptual in origin

Cited by 10 publications

References 46 publications

Information processing in sleep based on event-related activities of the brain

Information processing in sleep based on event-related activities of the brain

Cerebral Asymmetry in Insomnia Sufferers

Analysis of non-REM sleep staging with electroencephalography bispectral index

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