[Changes in innate forms of motor behavior in rats during long-term hypokinesia].

The structure of motor behaviour in response to environmental tests--"open field" and "with-a-partner" situation (according to P. V. Simonov)--was studied in rats after 1, 3 and 6 weeks of hypokinesis, (to K. Hecht), as compared to the control. In control animals a relatively low level of orienting-investigation reactions and of grooming was observed as well as a low alimentary activity, which is considered as a manifestation of innate passive defensive reactions in the above situations. Disappearance of these reactions in the course of hypokinesia has two stages: predominant increase in orienting-investigating reactions (1-3 weeks); their subsequent decrease and an increase in the grooming (after 6 weeks). The relation between innate and conditioned behavioural changes is discussed as well as stability of alimentary behaviour in rats.