A researcher is interested in studying aggression. In order to measure aggressiveness, he asks parents of nursery school children to rate how aggressive their child is, on a scale of 1 to 7. In this case, the rating that each parent gives his or her child is a __________________.

Which chemical pathway appears to be important both in some types of psychotic behavior and in the reinforcing properties of various drugs?

A. acetylcholine pathway from the nucleus basalis B. serotonin pathway from the raphe nuclei C. mesolimbic dopamine pathway D. glutamate pathway

Which of the following suggests that unconscious forces act to determine personality and behavior?

a) psychosexual development b) pleasure principle c) reality principle d) psychoanalytic theory