Abstract
Measures of verbal intelligence and abstract reasoning were taken on a group of 31 college-aged and 32 elderly adults, together with mental-processing rates associated with choice reaction time, primary memory scanning, and lexical decoding. Group means showed that both verbal IQ and lexical decoding were intact in the elderly subjects, a relationship in keeping with theorizing of Hunt (1978). In contrast, there were large declines in both Ravens scores and a variety of CRT measures, in keeping with theorizing of Jensen (1980). The group results were upheld at the level of individual subjects in the verbal domain, but in the case of CRT, only intercept values, not slopes, correlated with abstract reasoning. Memory-scanning rates were unrelated to intelligence measures.
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