Executive Functions and Task Switching

Vandierendonck, André · 2000 · Crossref

DOI: 10.5334/pb.963

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Summary

This review article examines the task-switching paradigm as a primary tool for investigating executive functions, addressing the historical lack of clarity surrounding the concept of the "central executive" in cognitive psychology and the "dysexecutive syndrome" in neuropsychology. The author argues that traditional neuropsychological tests suffer from validity and reliability issues due to the multifaceted nature of executive deficits and patient learning effects. Consequently, the paper advocates for the task-switching paradigm, which measures the time cost associated with switching between two tasks compared to repeating the same task, as a more precise method for isolating executive control processes. The review synthesizes experimental findings regarding "switch costs," specifically focusing on "residual switch costs" that persist even after long preparation intervals. The text contrasts two primary theoretical explanations for these residual costs. The first view, associated with Allport and colleagues, posits that residual costs result from "task-set inertia" or proactive interference, where strong previous task-sets require inhibition, leading to asymmetric costs depending on task strength. The second view, supported by Rogers, Monsell, and Mayr, suggests that residual costs stem from active, endogenous control processes, such as "backward inhibition," which are triggered by the stimulus and involve the suppression of irrelevant task sets. Evidence from alternating runs paradigms and studies on backward inhibition supports the involvement of both non-executive and executive mechanisms, though the specific nature of these controls remains debated. The paper also reviews the application of task-switching research in aging and clinical populations. While some studies using standardized tests like the Connections Test found no adverse effects of normal aging on switch costs when perceptual speed was controlled, other research indicates specific aging effects involving executive control. In clinical contexts, studies on schizophrenic patients reveal large switching costs, which the author attributes primarily to poor memory for task context and response rules rather than defective control processes alone. Additionally, limited brain imaging studies suggest prefrontal cortex involvement in task switching. The significance of this review lies in its call for a more precise definition of "task-sets" and the fractionation of executive functions. The author concludes that the central executive is likely not a unitary system but comprises distinct functions such as task shifting, inhibition, and updating. The task-switching paradigm is presented not as a standalone solution but as a valuable experimental tool that, when combined with other methodologies, helps clarify the mechanisms of executive control, working memory maintenance, and the cognitive organization of action.

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Topics

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• task switching
• executive function