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. 2002 Dec;17(4):690-695.
doi: 10.1037/0882-7974.17.4.690.

Can longitudinal changes in processing speed explain longitudinal age changes in fluid intelligence?

Daniel Zimprich  1 , Mike Martin  2
Affiliations

Can longitudinal changes in processing speed explain longitudinal age changes in fluid intelligence?

Daniel Zimprich et al. Psychol Aging. 2002 Dec.

Abstract

The processing-speed theory of cognitive aging contends tha age-related declines in intellectual function reflect the consequences of age-related slowing of processing speed. Cross-sectional data support this assumption. The association between 4-year changes in processing speed and 4-year changes in fluid intelligence was examined with a sample of 417 older adults. Changes in processing speed correlated .53 with changes in fluid intelligence. The difference in the explanatory power of processing speed regarding age-related differences and age-related changes is discussed with reference to other longitudinal studies and methodological considerations.

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