Zuckerman suggests that people who score highon psychoticism have a low sensitivity to

In discontinuity theories, growth

a) represents an accumulation of skills, habits, and discrimination. b) represents an increase of inputs into the organism. c) is manifested by radical changes in the structure of personality. d) is merely quantitative in nature.

Scientists who have studied pain mechanisms have discovered that

a. there is one set of receptors that responds to all forms of pain-producing stimuli. b. the location and intensity of pain is identified by mechanisms in the spinal cord. c. pain signals are sent to the central nervous system via two pathways. d. pain signals rarely reach the cerebral cortex of the brain.