Auto power and coherence analysis of delta-theta band EEG during the waking-sleeping transition period

Electroencephalography and Clinical Neurophysiology
T MorikawaT Hori

Abstract

To evaluate the spatio-temporal variation of delta and theta band EEGs during the waking-sleeping transition period, auto power and coherence analyses of scalp EEGs were carried out on 12 male subjects. The 7 auto power and 21 coherence values obtained from the 7 areas were studied every 20 s from 5 min before stage 1 onset to 24 min after stage 1 onset. The consecutive samples of spectra were computed for two frequency bands (delta: 2.5-3.5 Hz; theta: 4.0-7.5 Hz). Auto power started to increase after stage 1 onset and terminated 8.4 min after stage 2 onset. Topograms of each band power changed with progression towards deep sleep from the flat or relatively low voltage pattern without any focus to the frontopolar-parietal pattern or the fronto-parietal dominant pattern. Principal component analysis of the coherence values revealed generalized and localized components in each band. The generalized component was distributed across scalp areas, while the localized component was distributed in frontopolar-frontal areas. The generalized component decreased to the plateau level of non-rapid eye movement (NREM) sleep 5.4 min after stage 2 onset. The localized component started to increase after stage 1 onset and reached the plateau le...Continue Reading

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Citations

Aug 30, 2000·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·H Jing, M Takigawa
Oct 12, 2001·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·L De GennaroR Cristiani
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May 15, 2012·International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology·Aleksandar KalauziTijana Bojić
Nov 18, 2014·Frontiers in Systems Neuroscience·Kaier WangJamie W Sleigh
Oct 9, 2002·Perceptual and Motor Skills·Toshio MorikawaTadao Hori
Jul 27, 2017·Human Brain Mapping·Fabrizio VecchioPaolo Maria Rossini

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