We examined differences in the patterns of event-related EEG synchronization/desynchronization (ERS/ERD) in young men under conditions of complete inhibition of the triggered motor program of a manual movement (MM) and of inhibition of such program with subsequent switching over to an alternative motor task. Forty-two healthy volunteers (men, dextrals, age 18 to 23 years) took part in the tests. The ERS and ERD indices were estimated within the EEG frequency range 8–35 Hz in frontal, central, and parietal leads. In the series with cessation of the triggered MM program and its subsequent switching over to the alternative movement, modifications of neocortical EEG activity, compared to those at complete cessation of the movement, were the following: (i) comparative decrease in the ERS intensity with respect to the 9, 11, and 16 Hz oscillations in the fronto-central cortical regions and intensification of ERD at 11 and 16 Hz in parietal leads, (ii) relative intensification of ERS in the left central neocortical zone (11 Hz frequency), that in the right frontal and parietal zones (16 Hz frequency), and (iii) ERD for the frequencies of 19–20 Hz extensively developed in the neocortex (first of all, in the left hemisphere). Oscillations with the frequency 25 Hz and higher were synchronized to a greater extent at switching of the MM program than at complete cessation of this movement.
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