The data of a complex psychogenetic study are given devoted to investigation of mechanisms of psychological (behavioral) depression developing under the action of emotional stress of different genesis (two conventional models — 72 hrs social isolation and 3 hrs during each of 5 days immobilization were applied). In response to the stress stumuli action rat population was subdivided into high, middle and low anxiety level subgroups (HAL, MAL and LAL, correspondetly). Under emotional stress of both mentioned models MAL-animals demonstrated quite opposite responses: keep resistant, become labile and fall depressive. The obtained results testify to greater “ruthlessness” for the immobilization model than for social isolation.
