In the context of the brain, the density of synapses in the prefrontal cortex peaks at age 4.

Freud believed that the primary purpose of sexuality is

a) to accommodate latent aggression. b) to facilitate interpersonal relations. c) to seek pleasure and reduce tension. d) reproduction.

We pick up phones that are ringing, but rarely answer phones that are silent. This is an example of

a. stimulus generalization. b. stimulus control. c. systematic extinction. d. resistance to extinction.