[Electrophysiologic study of the reactions of the brain to regular and skipped acoustic stimuli in man].
Human electrical cerebral reactions to acoustic stimuli and to their omission at fixed moments of a restricted rhythmic sequence repeatedly presented in conditions of distraction and attraction of attention to stimuli, were recorded on the vertex. By special methods of bioelectrical signals processing on a computer, the potentials are singled out in response to stimulus omission (SO) with each set ordinal number, which, as well as the potentials, evoked by the actual stimulus (AS), possessed a main negative-positive complex N1P2. In conditions of attention distraction, the negative component of this complex had a latency of 144 ms and the positive one--about 207 ms. In the situation of the attraction of attention to stimuli a decrease of N1 latency up to 125 ms, took place, as well as complication of SO configuration due to the appearance of a later positive oscillation with a latency of about 560 ms, and parametres stabilization of SO as a whole. The analogous dynamics of N1 latency was characteristic of AS in both situations. The mechanisms of SO formation are discussed in connection with trace processes in the central nervous system.
D000161:Acoustic Stimulation / Q000379:methods; D000328:Adult; D001288:Attention / Q000502:physiology*; D001307:Auditory Perception / Q000502:physiology*; D001921:Brain / Q000502:physiology*; D003201:Computers; D005072:Evoked Potentials, Auditory; D005260:Female; D006801:Humans; D008297:Male; D009949:Orientation / Q000502:physiology; D010507:Periodicity; D011930:Reaction Time / Q000502:physiology
Elektrofiziologicheskoe issledovanie reaktsiĭ mozga na real'nye i propushchennye zvukovye stimuly u cheloveka.