What factor distinguishes bipolar 1 from bipolar 2?

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Prepare for the UCF CLP3143 Psychopathology Exam 2. Access comprehensive study materials, including flashcards and multiple-choice questions, each with hints and explanations. Get ready to excel in your exam!

The distinguishing factor between bipolar I and bipolar II disorder is the presence of manic episodes. In bipolar I disorder, individuals experience at least one manic episode, which is characterized by an abnormally elevated or irritable mood, increased energy, and other significant symptoms that can lead to marked impairment in social or occupational functioning. This manic episode is a key defining component of bipolar I.

In contrast, bipolar II disorder is characterized by at least one major depressive episode and at least one hypomanic episode, but it does not include full manic episodes. Hypomanic episodes are less severe than manic episodes and do not cause the same level of impairment.

Thus, the presence of manic episodes—and their absence in bipolar II disorder—is what clearly differentiates the two conditions.