The Contribution of Impaired Working Memory Monitoring to Performance of the Self-Ordered Pointing Task in Normal Aging and Parkinson's Disease

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The factors contributing to the working memory deficit observed in older adults and individuals with Parkinson's disease on the Self-Ordered Pointing Task were examined in 2 experiments. A detailed analysis of the error data revealed that errors tended to be clustered toward the end of a trial and that this effect was somewhat independent of set size. This pattern was proposed to result from a monitoring deficit where individuals failed to maintain an integrated representation of how far they had proceeded in the trial, an interpretation consistent with animal work byM. Petrides (1995).

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