[Dopamine concentration in the nigro-striatal system during elaboration and performance of conditioned avoidance reactions of various complexity in rats].

Experiments in rats revealed that complication of the avoidance conditioning induced a concomitant increase of the dopamine content in the striatum. The dopamine content changes were biphasic in the subst. nigra; its increase in the unilateral avoidance shifted to a decrease in the bilateral avoidance conditioning. Actualization of both simple and complicated avoidance responses was followed by a similar increase of the dopamine content in the striatum.