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Aging & Investing

To the Editor:

In the article “Aging & Investing: The Risk of Cognitive Impairment” (September 2011 AAII Journal), when David Laibson says that “Fluid intelligence would be the kind of intelligence used to solve a typical IQ question,” he implies incorrectly that IQ tests measure only fluid intelligence. The Wechsler Adult Intelligence Scale, the most widely used IQ test administered by psychometricians and psychologists, assesses at least as much crystallized as fluid intelligence, including subtests of Information and Vocabulary. Indeed, the Vocabulary subtest correlates most highly with the full-scale IQ.

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