Evolutionary theories of emotion suggest people exhibit ____ primary emotions

The reappearance of the response, called spontaneous recovery, explains why ________

a. classical conditioning occurs in mammals, but not in lower species. b. the salivary response is one of the few reflexes that can be conditioned. c. completely eliminating a conditioned response usually requires more than one session. d. learning always occurs when an unconditioned stimulus is paired with a neutral stimulus.

In the experimental method, the _____ is sometimes referred to as the treatment

a) independent variable b) dependent variable c) confounding variable d) heuristic value