Journals of Gerontology Series B: Psychological Sciences and Social Sciences, Vol 51, Issue 4 P189-P200, Copyright © 1996 by The Gerontological Society of America
Behavioral slowing with age: boundary conditions of the generalized slowing model
JM Swearer and KJ Kane
Department of Neurology, University of Massachusetts Medical Center, USA.
One hundred and twenty-two adults ranging in age from 20 to 83 years
participated in this study of visual discrimination and recognition. The
simultaneous-matching-to-sample (discrimination) and delayed-
matching-to-sample (recognition) paradigms used identical stimuli for
spatial frequency, luminance, spatial localization, orientation, pattern,
trajectory, and velocity matching. Linear regression analyses indicated
that increased age slowed reaction time on the simultaneous- matching
tasks. This relationship was not found, however, when subjects were
required to match the stimuli after a delay. When older adults' reaction
times were regressed on those of adults in their 20s, very different
patterns of age-related slowing emerged from the data as a function of task
requirements. The results from the simultaneous- matching paradigm
replicate previous reports of general slowing on nonlexical tasks, but this
was not true for the results from the delayed-matching paradigm, which used
similar stimuli but also involved short-term memory.