Baseline EEG gamma activity and induced responses to facial stimuli during the formation of a visual cognitive set |
| |
Authors: | V N Dumenko M K Kozlov |
| |
Institution: | 1.Institute of Higher Nervous Activity and Neurophysiology,Russian Academy of Sciences,Moscow,Russia |
| |
Abstract: | The power spectra of cortical potentials of baseline activity during interstimulus intervals (4 s; Fourier transform in the
frequency band of 1–60 Hz) and short-term (0.8 s) induced responses to facial stimuli (wavelet transform in the 15–60 Hz band)
were assessed during the study of the visual cognitive set to facial expression. Significant differences between groups of
subjects with different set plasticities were observed only at the set-testing stage. Estimation of short-term (0.8 s) induced
responses of wavelet spectra in the group with the plastic set revealed an increase in the power (compared to the power of
background activity) of the γ2 band (41–60 Hz) in the temporal, central and occipital areas of the left hemisphere, whereas in the group with the rigid
set these power spectra decreased. At the same time, the power in the γ1 band (21–40 Hz) was significantly lower (at the same level with the rigid form), indicating the discrete nature and functional
selectivity in the γ frequency band. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|