[Dynamics of the formation of 2 types of instrumental behavior in the rabbit].

The work is aimed at studying the dynamics of formation of a complex form of instrumental behaviour in rabbits, satisfying two different requirements of the organism. By pressing one and the same lever, the animals were able to fetch the feeding through with food and to periodically avoid pain stimulation preceded by an acoustic signal. The pairings: acoustic signal - pain stimulus were presented at periods of about 3 min against the background of the cyclic instrumental food-procuring behaviour and produced its temporary cessation. The changes of different parameters of the animals' behaviour in the process of their training are analysed in the aspect of the theory of functional systems.