After several weeks of feeling apathetic and dissatisfied with his life,Mark has suddenly become extremely cheerful and so talkative that he can't be interrupted.He seems to need less sleep and becomes irritated when his friends tell him to slow down.Mark's behavior is indicative of

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Mark's sudden change in behavior, including increased cheerfulness, talkativeness, need for less sleep, and irritability, are characteristic symptoms of a manic episode associated with bipolar disorder. Major depressive disorder is characterized by persistent feelings of sadness, hopelessness, and low energy, which do not fit Mark's current behavior. Rumination refers to repetitive negative thinking about past or present problems, which is not indicated in the scenario. Learned helplessness is a concept in psychology that describes a belief that one has no control over their situation or outcomes, which is also not relevant to Mark's behavior.

After Several Weeks of Feeling Apathetic and Dissatisfied with His