The results of studies investigating the role of biological factors suggest that depression is associated with

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Studies have consistently shown that depression is associated with decreased levels of norepinephrine, a neurotransmitter involved in attention, arousal, and mood regulation. This has led to the development of medications like tricyclic antidepressants and SNRIs that increase the availability of norepinephrine in the brain.

The Results of Studies Investigating the Role of Biological Factors