 That is to say, if uncontrollable and unstoppable stressors are repeated for long enough, a rat subject will adopt a learned helplessness, which shares a number of behavioral and psychological features with human depression.The subject will not attempt to cope with problems, even when placed in a stressor-free novel environment.Should their rare attempts at coping prove successful in a new environment, a long lasting cognitive block prevents them from perceiving their action as useful and their coping strategy does not last long.