[Influence of blockade of the dopaminergic D1/D2 receptors on choice behaviour at different by validity reinforcements in cats].

The influence of two selective antagonists of the dopaminergic receptors, raclopride (D2) and SCH 23 390 (D1) on behavior of "impulsive" and "self-controlled" cats was similar directed. A selective blockade of the dopaminergic D1/D2 receptors by use of raclopride and SCH 23 390 changed a behavioural choice strategy of two different by validity and delay reinforcements in impulsive cats, but did not change it substantially in "self-controlled" animals. Increase of doses of raclopride and SCH 23 390 led to decrease of a part of the short-latency and increase of a part of the long-latency reactions (pedal pressings) in a total number of all effective responses. This occurred only in "impulsive" animals, that indicates probably the decrease of impulsive properties of their behaviour. Both compounds did not affect the choice strategy (a low quality immediate vs. a high quality delayed reinforcements) in "self-control" animals, but elicited more errors and inhibitory responses in their behavior. The data obtained are not consistent with the "dopamine" hypothesis, which predicts increase of impulsivity under influence of dopaminergic antagonists. The reasons that might lead to the data obtained are discussed.