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Topographical frequency dynamics within EEG and MEG sleep spindles.


ABSTRACT: Spindles are rhythmic bursts of 10-16 Hz activity, lasting ?1 s, occur during normal stage 2 sleep. Spindles are slower in frontal EEG and possibly MEG. The posterior-fast EEG pattern may predominate early in the spindle, and the anterior-slow pattern late. We aimed to determine the proportion of spindles showing this spatio-spectro-temporal interaction for EEG, and whether it occurs in MEG.We recorded high density EEG and MEG from seven healthy subjects during normal stage 2 sleep. High vs. low frequency (12 vs. 14 Hz) power was measured early vs. late (25th-45th vs. 55th-75th duration percentile) in 183 spindle discharges.The predicted spatio-spectro-temporal interaction was shown by 48% of EEG and 34% of MEG spindles (chance=25%). Topographically, high frequency EEG power was greatest at midline central contacts, and low frequency power at midline frontal. This frequency-specific topography was fixed over the course of the spindle.An evolution from posterior-fast to anterior-slow generators commonly occurs during spindles, and this is visible with EEG and to a lesser extent, MEG.The spatio-spectral-temporal evolution of spindles may reflect their possible involvement in coordinating cortical activity during consolidation.

SUBMITTER: Dehghani N 

PROVIDER: S-EPMC2978261 | biostudies-literature | 2011 Feb

REPOSITORIES: biostudies-literature

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Topographical frequency dynamics within EEG and MEG sleep spindles.

Dehghani Nima N   Cash Sydney S SS   Halgren Eric E  

Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology 20100715 2


<h4>Objective</h4>Spindles are rhythmic bursts of 10-16 Hz activity, lasting ∼1 s, occur during normal stage 2 sleep. Spindles are slower in frontal EEG and possibly MEG. The posterior-fast EEG pattern may predominate early in the spindle, and the anterior-slow pattern late. We aimed to determine the proportion of spindles showing this spatio-spectro-temporal interaction for EEG, and whether it occurs in MEG.<h4>Methods</h4>We recorded high density EEG and MEG from seven healthy subjects during  ...[more]

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