EEG data, obtained in 3 groups of young (18–30 years) subjects during different experimental conditions (background brain activity with open/closed eyes, emotional face recognition and stop-signal task) were analyzed. Event-related desynchronization (ERD) and event-related spectral perturbations (ERSP) were used as functional response measures. Individual cortical distributions of these responses were compared for different modalities. Group 1 (32 women, 16 men) performed stop-signal task, group 2 (21 women, 19 men) – facial expression recognition task, and group 3 (2 women, 13 men) both of these tasks. Background EEG with open and closed eyes was recorded in all three groups. EEGs for groups 1 and 2 were recorded using 32-channel “Neurovisor-24” amplifi er, and for group 3- by 132-channel “Neuroscan” amplifi er. Event-related reactions were obtained using ERD for group 1 and ERSP for groups 2 and 3. Percentage change was used as measure of reaction on opening eyes. Electrodes were grouped into clusters with similar “behavior” separately for each condition using factor analysis with principal components extraction and varimax rotation. Number of Identifi ed clusters increased and size of clusters decreased with increase of analyzed frequency. Importantly, clusters for each frequency (especially for lower ones) were similar between different conditions, but differed between subjects, supporting hypothesis of stability of brain oscillatory systems’ spatial characteristics.
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