期刊
COGNITIVE PSYCHOLOGY
卷 60, 期 3, 页码 127-157出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.cogpsych.2009.09.001
关键词
Reaction time; Aging; IQ; Diffusion model; Individual differences
资金
- NIA [R01-AG17083]
- NIMH [R37-MH44640]
The effects of aging and IQ on performance were examined in three two-choice tasks: numerosity discrimination, recognition memory, and lexical decision. The experimental data, accuracy, correct and error response times, and response time distributions, were well explained by Ratcliffs (1978) diffusion model. The components of processing identified by the model were compared across levels of IQ (ranging from 83 to 146) and age (college students, 60-74, and 75-90 year olds). Declines in performance with age were not significantly different for low compared to high IQ subjects. IQ but not age had large effects on the quality of the evidence that was obtained from a stimulus or memory, that is, the evidence upon which decisions were based. Applying the model to individual subjects, the components of processing identified by the model for individuals correlated across tasks. In addition, the model's predictions and the data were examined for the worst performance rule, the finding that age and IQ have larger effects on slower responses than faster responses. (C) 2009 Elsevier Inc. All rights reserved.
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