A group of young participants were compared with 2 groups of older participants (young-old, 65-74 years and old-old, 75 years or over) on a range of frontal lobe tasks. They were also assessed on the Digit Symbol Substitution Test (DSST), a test of digit cancellation (DC), the AH4 test of fluid intelligence, and the National Adult Reading Test (NART) - a measure of crystalized intelligence. Reliable age differences on all frontal measures except word fluency (FAS) were found. However, age effects were radically attenuated when either DSST speed or Alice Heim 4 (AH4) performance was used as a covariate. In contrast, DC and NART attenuated age-related variance to a much lesser degree. The authors conclude that a large proportion of age- related variance on measures of frontal lobe function may be attributed to a more general factor characterized jointly by DSST and AH4 performance.
CITATION STYLE
Parkin, A. J., & Java, R. I. (1999). Deterioration of frontal lobe function in normal aging: Influences of fluid intelligence versus perceptual speed. Neuropsychology, 13(4), 539–545. https://doi.org/10.1037/0894-4105.13.4.539
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