Topographic cortical mapping of EEG sleep stages during daytime naps in normal subjects.

摘要: Computer-generated cortical maps of power spectral estimates derived from 16 leads were drawn based on daytime sleep recordings in four normal volunteers. These data compiled nine 10-s artifact-free, EEG epochs awake, stages 1-4 and REM each volunteer. placed the left hemisphere midline according to 10-20 system with additional interpolated posterior locations. Magnitude 1 Hz resolution adjacent frequencies (delta 2-4, alpha 8-12, beta 13-18) analyzed two-way ANOVA (lead by stage). Delta activity was relatively uniform low amplitude eyes-closed subjects, REM. increased at vertex stage 1. With progressing, non-REM stages, it enlarged radially intraparietal sulcus posteriorly, superior frontal gyrus anteriorly. Comparison ear a computed average reference yielded similar topographic patterns. Alpha expectedly maximal occipitally awake but surprisingly area appeared slow wave sleep. Beta subjects parietally; showed even lower more distribution. Stage 2 greatest power, concentrated vertex, 3 4 diminishing. suggest that are not completely electrophysiologically across cortex. This opens possibility for new method diagnosis disorders alternatives staging.