Gorna O. The behaviourial reaction of animals with the varied type of motor asymmetry under the circumstances of chronic and pain stresses

The changes of animals with the varied type of motor asymmetry behaviourial reactions under the circumstances of chronic hypokinetic and sharp pain stress-factors isolated influence and their combination are studied. It is shown that rats which have the varied type of motor asymmetry differ by individual-typological peculiarities of their behaviour in the test of "the open field". The rats' motor asymmetry difference correlates inversely (r=-0,68; p<0,05) with the level of animals' mobility: high - rats with the left-side motor asymmetry, middle - rats with the right-side one, and low - rats without distinct motor asymmetry. The development of stress-reaction causes a significant change of motor asymmetry coefficients up to the inversion of their signs and stimulates distinct changes of animals' behaviourial reactions in the tests "the open field" and "formalin", the manifestations of which depend significantly on the motor lateralization. While modeling chronic hypokinetic and sharp pain stresses as well as their combined action, it was found that the ambidexter and "right-handed" animals' behaviour tend to be connected with the increase of active behaviour and as a result - the increase of excitability. The rats without distinct motor asymmetry show such increase of excitability more intensively than the right-handed rats. The "left-handed" rats demonstrated opposite changes of behaviourial reactions, which prove the increase of general mobile deficiency, development of inhibition, the protective reaction of "stagnation" which is the result of the emotional reaction of fear, the state of animal's central nervous system general hindrance. Thus, the changes found in the pattern of animals behaviourial reactions from different individual-typological groups prove that the type of motor asymmetry can serve the criterion of their sensitiveness to the stress influences.