Citation

Verhaeghen P, Cerella J, Basak C. Aging Neuropsychol. Cogn. 2006; 13(2): 254-280.

Affiliation

Department of Psychology, Syracuse University, Syracuse, New York 13244-2340, USA. pverhaeg@psych.syr.edu

Copyright

(Copyright © 2006, Informa - Taylor and Francis Group)

DOI

10.1080/138255890969267

PMID

16807201

Abstract

We examined the information-processing functions (response-time x load) of younger and older adults for two verbal and one visuo-spatial task; each task was implemented in a baseline and a high-complexity condition. Heightened complexity transformed the baseline functions in either an additive or a multiplicative fashion. The processing efficiency of older adults was defined as the old-young ratio of the slopes of the load functions. Three levels of efficiency could be distinguished. The first level, with an age-related slowing factor of about 1.2, consisted of low-complexity verbal processing and additive-complexity verbal processing. The second level, associated with a slowing factor of about 1.6, consisted of a mixture of verbal-high-multiplicative-complexity processing and visuo-spatial-low-complexity processing. The third level, with a slowing factor of about 4, consisted of visuo-spatial processing of high multiplicative complexity. The results go against any common factor theory of aging. Instead, they suggest that a shift from a higher to a lower mode of efficiency is triggered by a greater degree of working memory involvement.

Language: en