The idea that people choose mates on the basis of particular characteristics is called

Any knob, handle, button, lever, or other device used to alter the activity of a machine is referred to as a(n)

a. cybernetic device. b. control. c. ergonomic device. d. display.

Which theory of depression claims that depression is related to a lack of response-contingent positive reinforcement?

a. psychodynamic b. behavioral c. cognitive d. attachment