Personality and IQ have traditionally been viewed as distinct domains of human functioning. However, research over the past three decades suggests that IQ is a personality trait. In an excellent book chapter, personality neuroscientist Colin DeYoung points out that many personality traits involve cognitive processes and abilities. It’s just that IQ is primarily measured with ability tests, whereas personality tests are primarily measured with questionnaires. But this is more a reflection of a lack of ingenuity on the part of psychologists than a real difference in domain of human functioning.
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