Biological Theories of Depression pdf free download. Biological theories regarding the etiology of depression date back to antiquity. Hippocrates is credited with advancing one of the first biological hypotheses. He felt that the accumulation of “black bile” and phlegm
affected brain functioning, “darkening the spirit and making it melancholic” (Lewis, 1967). Over the centuries, theories have continued to be proposed, often reflecting the general scientific interests and advancements of the times. During the past quarter century, hypotheses as to the biological pathogenesis of depressive illness have rapidly evolved.
Biological Theories of Depression pdf free download

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