[Behavioral instrumental reactions and the frequency of cardiac contractions in chimpanzees with different rates of approaching a goal and a shortened time of its exposure].

Reaching the goals moving with different speed (from 1 to 400 mm/sec), the chimpanzee revealed respective behavioural, emotional, instrumental, and cardiovascular responses. When obscuring the goal for a certain time, the chimpanzee nevertheless managed to reach it, the relations between the speed of approaching goal and behavioural or instrumental responses being preserved. Thereupon, the chimpanzee are able to reach the goal provided the latter's trace exceeds 5-10-fold the time of really acting stimulus.

[Adaptation of a 4-year-old chimpanzee to an unusual stimulus].

A complex of adaptive reactions have been observed in response to the unusual irritants in 4-year chimpanzee infant. It includes the orienting-research, passive defence reactions, avoidance of irritant, transfer on co-operation with experimenter, aggressive reactions to unusual irritants. The analysis of behaviour reactions and cardiac rhythm has revealed that playing with an experimentator and aggressive reactions are the most reliable way of adaptation which prevents strong and long emotional stress.