If neurotransmitters are linked to depression, which of the following would be LEAST likely to be observed in a study?
A) Lower levels of certain neurotransmitters in people who are depressed compared with those who are not depressed
B) An increase in depressive symptoms after a person take a drug that blocks the effects of certain neurotransmitters
C) A decrease in depressive symptoms once certain neurotransmitter levels in people with depression have been restored
D) A near-zero correlation between certain neurotransmitter levels and the number or severity of depressive symptoms a
person reports