title: Can longitudinal changes in processing speed explain longitudinal age changes in fluid intelligence?
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.
authors.affiliation: U Heidelberg.
authors.forename: Daniel
authors.initials: D
authors.lastname: Zimprich
authors.affiliation: Rotman Research Inst.
authors.forename: Mike
authors.initials: M
authors.lastname: Martin
mesh_terms: D000368:Aged; D000375:Aging / Q000523:psychology*; D005260:Female; D006801:Humans; D007360:Intelligence; D008137:Longitudinal Studies; D008297:Male; D008606:Mental Processes; D008875:Middle Aged