________ refers to the desire to engage in an activity because we enjoy it, not because we expect external rewards

In the process of perception, the brain

a. senses the presence of objects in the world. b. produces experiences of vision, hearing, and so on. c. forms meaningful impressions by piecing together sensory information. d. transforms sensory signals into sensations. e. converts external stimulation into neural signals.

DSM-I was published in the

a. 1930s. b. 1940s. c. 1950s. d. 1960s.