[Beta-rhythm parameters changes during cognitive set to emotional facial expression with supplemented long-time interval between a warning and a target stimulus].

Beta-rhythm parameters during cognitive set to emotional facial expression were investigate in 35 healthy adults. Formation of the set was supplemented long-time interval (8 c) between a warning and a target stimulus. Rhythmical component of EEG were revealed using wavelet functions. Maximum and mean levels of wavelet coefficient (WLC) in the beta-rhythm were analyzed. We obtained 3 groups of subjects depend on mistakes of recognition facial expression. Group with correct recognition had high WLC mean level during the experiment, WLC maxima during first second of inter-stimulus interval, large latency of WLC maxima during the stage forming and predominance level WLC maxima in the left hemisphere. Two groups of subjects with mistakes in recognition had low WLC mean, maxima and their latency during set forming. Right hemisphere (WLC maxima) dominated in these groups.