Researchers generally believe that problems with neurotransmitter activity are associated with depression, and several lines of evidence support this belief. At the same time, chemical models of depression are inadequate because __________.

A) antidepressant drugs work immediately to increase neurotransmission, but clinical effects generally do not become apparent for several weeks
B) the chemical structure of the drugs is impossible to assay
C) the proper drug dosage is impossible to decide on
D) brain chemicals can only be measured postmortem

Question

Zybrea Knight · Accepted Answer

Final Answer : A, Explanation :  Antidepressant drugs indeed increase neurotransmitter levels quickly, but their mood-improving effects take weeks to manifest, suggesting that the relationship between neurotransmitter levels and depression is more complex than a direct cause-and-effect. This discrepancy highlights the inadequacy of purely chemical models of depression.

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