The results of a variety of normative and comparative studies of the Wechsler intelligence tests were garnered from the literature. These studies are used to examine changes in intelligence test performance over time. The data indicate that there are changes both across ages and across year-of-birth cohort, as well as an interaction between age and year of birth. The data strongly suggest that over generations people are increasing in average performance for longer periods of time to higher levels of performance. As a result, the Wechsler tests get successively harder with each standardization, and this change is greater for adults than for adolescents. Another result is an increase in average IQs obtained from any Wechsler adult test of about 1 IQ point for every 4 years since standardization. Frequent updates of norms are suggested, and two ‘ballpark’ strategies for making between-test or between-occasion comparisons are suggested.

Keywords:
Adult development, Age differences, Cohort, Intelligence, Intelligence measures, Wechsler intelligence test
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© 1986 S. Karger AG, Basel
1986
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