People who score high on intelligence tests exhibit a. more neural plasticity and faster brain-wave responses to simple stimuli than do those with lower scores. b. less neural plasticity and slower brain-wave responses to simple stimuli than do those with lower scores. c. more neural plasticity and slower brain-wave responses to simple stimuli than do those with lower scores. d. less neural plasticity and faster brain-wave responses to simple stimuli than do those with lower scores.