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The Neurobiological Factors Associated with Depression


Depression is a mood disorder that affects approximately ten percent of men and nearly twenty-five percent of women at least once in their lifetime (1). There are several types of clinical depression, such as unipolar depression and bipolar depression. Unipolar depression consists of primarily depressive states while bipolar depression involves a fluctuation between states of depression and mania (2). Some of the most common symptoms of depression include excessive feelings of sadness, guilt, or worthlessness, a significant change in appetite, insomnia or hypersomnia, energy loss, thoughts or attempts of suicide, and anhedonia (3), (4). While the symptoms of depression are understood fairly well, how the exact causes of the disorder interact in the development of depression remain somewhat of a mystery.

There are several biological factors that may contribute to the increased susceptibility to depression. Genetic links have been made as the result of twin studies suggesting that family members of depressed patients are mo... [to view the full essay now, purchase below]

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