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Biological Theories of Manic-Depression


Like every mental illness, there is no definitive evidence concerning the etiology of manic-depression, also known as bipolar disorder. The disorder is characterized by alternating periods of depression and mania and occurs in 1% of the population. The depressive episodes can range in severity from dysthymia to major depressive episodes. The major depressive episodes are classified as periods of at least two weeks in length during which sadness, lethargy, insomnia or excessive sleep, increase or decrease in appetite, hopelessness, and suicidal ideation or suicide attempts are present. Dysthymia is the milder form of depression, during which suicidal ideation and attempts are not present. Manic episodes are of at least two weeks in duration and are characterized by euphoria, flight of ideas, grandiose delusions, pressured speech, increased activity, and insomnia. Manic episodes can also vary in intensity; the milder form of a manic episode is known as hypomania and can be distinguished from a full-blown manic attack by its lack of psychoti... [to view the full essay now, purchase below]

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