[Prestimulus EEG gamma frequencies during formation of a cognitive set to facial expression].
Prestimulus EEG power spectra from different cortical areas in frequency band 1-60 Hz were studied at a stage of formation of the cognitive set to facial expression. Diversity of individual power spectra of baseline EEGs, especially in gamma frequency band 41-60 Hz makes averaging individual spectra impossible. The authors pioneered in finding that, in prestimulus periods, EEG frequencies 41-60 Hz were of higher information value than frequencies 1-20 and 21-40 Hz. The highest power of the gamma frequencies was revealed in the frontal areas of the right hemisphere in subjects with a plastic set. In the group with a rigid set, gamma frequencies of high power prevailed in the posterotemporal and occipital areas of the left hemisphere.
Dumenko
V N
VN
Kozlov
M K
MK
Kurova
N S
NS
Cheremushkin
E A
EA
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