All of these categories of failure of rational judgment and decision-making are very imperfectly correlated with intelligence — meaning that IQ tests tend not to capture individual differences in rational thought. Intelligence tests measure mental skills that have been studied for a long time, whereas psychologists have only recently had the tools to measure the tendencies toward rational and irrational thinking. Nevertheless, recent progress in the cognitive science of rational thought suggests that nothing — save for money — would stop us from constructing an “RQ” test.
Such a test might prove highly useful. Suboptimal investment decisions have, for example, been linked to overconfidence in knowledge judgments, the tendency to over-explain chance events, and the tendency to substitute affective valence for thought. Errors in medical and legal decision-making have also been linked to specific irrational thinking tendencies that psychologists have studied.
There are strategies and environmental fixes for the thinking errors that occur in all of these domains. But it is important to realize that these thinking errors are more related to rationality than intelligence. They would be reduced if schools, businesses, and government focused on the parts of cognition that intelligence tests miss. Instead, these institutions still devote far more attention and resources to intelligence than to teaching people how to think in order to reach their goals. It is as if intelligence has become totemic in our culture. But what we should really be pursuing is development of the reasoning strategies that could substantially increase human well-being.
Keith E. Stanovich is professor of Human Development and Applied Psychology at the University of Toronto and the author of What Intelligence Tests Miss: The Psychology of Rational Thought.
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