Laboratory research has shown that rats who are allowed to escape shock, and thereby reduce the level of stress they experience, show:

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Research has shown that reduced stress levels lead to better immune system function in rats. Therefore, rats who are allowed to escape shock and reduce stress levels are expected to exhibit better immune system function than rats who receive no shock. Moreover, the phenomenon of learned helplessness occurs when animals (or humans) experience a lack of control over a negative event, leading to a sense of hopelessness and passivity. Therefore, rats who are allowed to escape shock are less likely to show learned helplessness than rats who receive no shock.

Laboratory Research Has Shown That Rats Who Are Allowed to Escape