Learned helplessness is behavior typical of an organism (human or animal) that has endured repeated painful or otherwise aversive stimuli which it was unable to escape or avoid. After such experience, the organism often fails to learn escape or avoidance in new situations where such behavior would be effective. In other words, the organism seems to have learned that it is helpless in aversive situations, that it has lost control, and so it gives up trying. Such an organism is said to have acquired learned helplessness. Learned helplessness theory is the view that clinical depression and related mental illnesses may result from such real or perceived absence of control over the outcome of a situation.