title: Prestimulus EEG gamma frequencies during formation of a cognitive set to facial expressions.
abstract: The power spectra of baseline (prestimulus) EEG recordings from various parts of the cortex in the band 1-60 Hz were studied in adult subjects during the stage of formation of a cognitive set to facial expressions. Individual variability in the power spectra of the baseline EEG, particularly in the gamma range (41-60 Hz) made it impossible to average spectra from different subjects. This is the first study demonstrating that the EEG at 41-60 Hz was more informative during the prestimulus period than recordings at 1-20 Hz and 21-40 Hz. High levels of gamma-frequency power were found to be dominant in the frontal areas of the right hemisphere in groups of subjects with plastic sets; the group of subjects with a rigid set showed dominance of gamma-frequency power in the posterior temporal and occipital areas of the left hemisphere.
authors.affiliation: Institute of Higher Nervous Activity and Neurophysiology, Russian Academy of Sciences, Moscow, Russia. vdumenko@yandex.ru
authors.forename: V N
authors.initials: VN
authors.lastname: Dumenko
authors.forename: M K
authors.initials: MK
authors.lastname: Kozlov
authors.forename: N S
authors.initials: NS
authors.lastname: Kurova
authors.forename: E A
authors.initials: EA
authors.lastname: Cheremushkin
mesh_terms: D000328:Adult; D001931:Brain Mapping / Q000379:methods; D002540:Cerebral Cortex / Q000502:physiology*; D003071:Cognition; D004569:Electroencephalography; D004644:Emotions; D005149:Facial Expression; D005260:Female; D006801:Humans; D008297:Male; D012718:Set, Psychology