Which of the following has not been proposed as a biological substrate of personality?

Which area of the brain undergoes the greatest movement toward maturity from adolescence into young adulthood?

a. the frontal lobes b. the hippocampus c. the left hemisphere d. the visual cortex

When we say that speech goes "underground," we mean that it becomes:

a. unconscious. b. self-spoken. c. sub-vocal. d. subversive.