Jason smokes crack cocaine. When he first started using, he used to get high off a small amount but now he finds he needs to smoke more and more to get the same high. This is an example of:

Some critics have argued that in his therapy sessions Freud actually uncovered evidence of

a) regressed memories. b) childhood sexual abuse. c) psychopathic tendencies. d) multiple personality disorder.

Aspiring singers copy the song style, and sometimes even the clothing, of established stars. What kind of learning is this?

a. Classical conditioning b. Primary reinforcement c. Fixed-interval reinforcement d. Vicarious reinforcement