Drugs that increase the activity of a particular neurotransmitter are said to be __________ of that neurotransmitter

Around _____ percent of all adults may experience an episode of severe unipolar depression at some point in their lives.

A) 6 B) 18 C) 28 D) 42

Cocaine addiction and self-stimulation both appear to involve the excitation of brain

centers that are involved with (a) language (b) sex (c) memory (d) sleep