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  • Title: Executive functioning and processing speed in age-related differences in memory: contribution of a coding task.
    Author: Baudouin A, Clarys D, Vanneste S, Isingrini M.
    Journal: Brain Cogn; 2009 Dec; 71(3):240-5. PubMed ID: 19796862.
    Abstract:
    The aim of the present study was to examine executive dysfunctioning and decreased processing speed as potential mediators of age-related differences in episodic memory. We compared the performances of young and elderly adults in a free-recall task. Participants were also given tests to measure executive functions and perceptual processing speed and a coding task (the Digit Symbol Substitution Test, DSST). More precisely, we tested the hypothesis that executive functions would mediate the age-related differences observed in the free-recall task better than perceptual speed. We also tested the assumption that a coding task, assumed to involve both executive processes and perceptual speed, would be the best mediator of age-related differences in memory. Findings first confirmed that the DSST combines executive processes and perceptual speed. Secondly, they showed that executive functions are a significant mediator of age-related differences in memory, and that DSST performance is the best predictor.
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