Learned helplessness is the behavior exhibited by a subject after enduring repeated aversive stimuli beyond their control. In humans, learned helplessness is related to the concept of self-efficacy, the individual's belief in their innate ability to achieve goals. Learned helplessness theory is the view that clinical depression and related mental illnesses may result from a real or perceived absence of control over the outcome of a situation.
Foundation of research and theory Learned helplessness was initially thought to be a subject's acceptance of their powerlessness following repeated exposure to an aversive stimulus that was difficult to avoid or escape. It was evidenced by their discontinuing attempts to avoid or escape the stimulus, even when such alternatives were unambiguously presented. Over the past few decades, neuroscience research has shown that the brain's default state is to assume that control is not present. The presence of control is therefore learned. However, it is unlearned when a subject is faced with prolonged aversive stimulation.
Early experiments
American psychologist Martin Seligman initiated research on learned helplessness in 1967 at the University of Pennsylvania as an extension of his interest in depression. This research was later expanded through experiments by Seligman and others. One of the first was an experiment by Seligman & Overmier: In Part 1 of this study, three groups of dogs were placed in harnesses. Group 1 dogs were simply put in a harness for a period of time and were later released. Groups 2 and 3 consisted of "yoked pairs". Dogs in Group 2 were given electric shocks at random times, which the dog could end by pressing a lever. Each dog in Group 3 was paired with a Group 2 dog; whenever a Group 2 dog got a shock, its paired dog in Group 3 got a shock of the same intensity and duration, but its lever did not stop the shock. To a dog in Group 3, it seemed that the shock ended at random because it was their paired dog in Group 2 that was causing it to stop. Thus, for Group 3 dogs, the shock was "inescapable". In Part 2 of the experiment, the same three groups of dogs were tested in a shuttle-box apparatus (a chamber containing two rectangular compartments divided by a barrier a few inches high). All of the dogs could escape shocks on one side of the box by jumping over a low partition to the other side. The dogs in Groups 1 and 2 quickly learned this task and escaped the shock. Most of the Group 3 dogs—which had previously learned that nothing they did had any effect on shocks—simply lay down passively and whined when they were shocked. In a second experiment later that year with new groups of dogs, Maier and Seligman ruled out the possibility that, instead of learned helplessness, the Group 3 dogs failed to avert in the second part of the test because they had learned some behavior that interfered with "escape". To prevent such interfering behavior, Group 3 dogs were immobilized with a paralyzing drug (curare) and underwent a procedure similar to that in Part 1 of the Seligman and Overmier experiment. When tested as before in Part 2, these Group 3 dogs exhibited helplessness as before. This result serves as an indicator for the ruling out of the interference hypothesis. From these experiments, it was thought that there was to be only one cure for helplessness. In Seligman's hypothesis, the dogs do not try to escape because they expect that nothing they do will stop the shock. To change this expectation, experimenters physically picked up the dogs and moved their legs, replicating the actions the dogs would need to take in order to escape from the electrified grid. This had to be done at least twice before the dogs would start willfully jumping over the barrier on their own. In contrast, threats, rewards, and observed demonstrations had no effect on the "helpless" Group 3 dogs.
Later experiments Later experiments have served to confirm the depressive effect of feeling a lack of control over an aversive stimulus. For example, in one experiment, humans performed mental tasks in the presence of distracting noise. Those who could use a switch to turn off the noise performed better than those who could not turn off the noise. Simply being aware of this option was enough to substantially counteract the noise effect. In 2011, an animal study found that animals with control over stressful stimuli exhibited changes in the excitability of certain neurons in the prefrontal cortex. Animals that lacked control failed to exhibit this neural effect and showed signs consistent with learned helplessness and social anxiety. A 1992 study showed that the non-contingency between responses and outcomes when solving chess problems leads to a state of learned helplessness with chess players ranging from weak amateurs to professional players. The effects were proportional to the degree of similarity between the treatment and the task used in the post-test.
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