[Features of the formation and retention of a motor-defensive conditioned reflex in rats of various strains].

Comparison of the dynamics of elaboration and stabilization of a motor defensive conditioned reflex in rats of Wistar line and in grey rats showed that the latter significantly forestalled the white laboratory rats in the speed of conditioning. Their behaviour was characterized by a higher level of excitability and activity and a weaker passive defensive behaviour; this probably contributed to a more effective formation of temporary connection with biologically negative reinforcement. Individual typological differences did not conceal the interlinear ones, while in stress situations they can sometimes be at the foreground.