Which of the following statements best summarizes the relationship between brain size and intelligence?
a. Brain size is a perfect predictor of intelligence-the larger the brain, the greater the intelligence.
b. There is no relationship between brain size and intelligence whatsoever.
c. Brain size and intelligence are related only in Caucasian people.
d. There are modest correlations between brain size, convolutions of the cortex, and intelligence.
Answer: D
Rationale: This gray surface varies in thickness from person to person, and the thickness of the cortex is highly associated with general intelligence.
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Currently, psychological services are available through
a. the radio and television. b. the telephone. c. the Internet. d. all of these.