Depression has been linked to low activity of the neurotransmitters ________ and ________.

John is doing his income taxes and talking to his daughter on the phone at the same time. His successful multitasking is evidence that he is adept at using his cognitive resources

Indicate whether this statement is true or false.

Your friend misses work and has serious family difficulties because he uses drugs. However, he is not addicted to drugs. His disorder would be categorized as

a) substance abuse. b) substance craving. c) substance dependence. d) substance ingestion habit.