, den Boer, 100).
             The role of biology, however, is unclear. "Our genetics and biochemistry play a considerable role in all experiences; even when we consider how much our families or culture influence us, we can say that we are biologically predisposed to be sensitive to our environment" (Yapko, 13). Since medications aimed at altering brain chemistry obviously work, the problem boils down to the question of what comes first. Can someone be born depressed? Is there some inherent weakness that may break with a stressor as in a diathesis-stress model? Or is the biological imbalance a product of the depression? The question of nature versus nurture has long been an issue with a host of psychological problems, but in the case of depression, the verdict is out. "While there are many correlates of depression at the level of biological processes, few of these processes can be said to be established as causal, and even fewer can be identified as pathological rather than simply variations of normal functioning&qu
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