Abstract
There is a renewed interest in the so-called age differentiation hypothesis—and the related age dedifferentiation hypothesis. The former states a reduction in the size of g at the first stage of life until early maturity. The latter hypothesized an increase in the importance of g at late adulthood and a decrease in the number of factors. The Spanish standardization of the WAIS-III ( N=1369) was used in the present study to test the age dedifferentiation hypothesis. The results show no changes in the percentage of variance accounted for by g and four group factors (Verbal, Perceptual Organization, Working Memory, and Processing Speed) when the restriction of range is controlled. The age- indifferentiation hypothesis, as well as the anatomical metaphor, is proposed as a more fine-grained perspective to look at the development of the structure of cognitive abilities along the life span.
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