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Intersystem relations in the structure of activity: Research of sequential effects in choice task




B. N. Bezdenezhnykh *, . V. Bodunov **

* Cand. sci. (medicine), senior res. ass., IP RAS, Moscow

** Cand. sci. (psychology), leading res. ass., the same Institute

In two-choice reaction time 15 Ss released as quickly as possible rest position key (RP) and pressed response key (RK) at appearance of one visual stimulus (quick response - Q) and released RP and pressed another RK as quickly as possible at disappearance of another stimulus, i. e. 900 msec after its appearance (delay response -D). In four successive series there was improvement of performance in terms of the shortening of RT in both Q and D from the first to the last series. At the beginning of task performance the sequential effects (SE) were noticed. It manifested itself as the influence of previous response on RT of current response and latency and amplitude of related P300 in frontal and parietal areas of cortex. SE varied individually and depended on the forms of previous and current responses. In the course of performance improvement SE disappeared on the P300 latency at first in frontal and then in parietal areas; in so doing the latency of P300 related to Q stabilized in more short interval than one related to D. It is proposed that this stabilization is due to improvement of relation between the systems involved in current response. The improvement is accounted for not only by inhibition of unnecessary systems bun also by coordination of the beginnings of systems' activation which provided response. The neurons which are substantially localized in frontal cortex played a key part in this coordination. It is proposed that these neurons represented the image of current response or the acceptor of action results (AAR) in terms of theory of functional system by P.K. Anokhin. The generation of AAR is manifested by the development of P300.

Key words: subjective expectancy, acceptor of action results, intersystem relations, frontal and parietal areas, P300.

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