Differential Contributions of Set-Shifting and Monitoring to Dual-Task Interference

Cooper, Richard; Wutke, Karolina; Davelaar, Eddy J. · 2011 · OpenAlex-citations

DOI: 10.1080/17470218.2011.629053

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Summary

This paper investigates the specific contributions of distinct executive functions—specifically set-shifting and monitoring—to performance on complex cognitive tasks. While previous research, notably by Miyake et al. (2000), used Confirmatory Factor Analysis and Structural Equation Modeling to argue that complex tasks like the Wisconsin Card Sorting Test (WCST) and Random Number Generation rely on separable executive functions, these statistical methods are prone to error due to highly correlated latent factors. To address this limitation, Cooper, Wutke, and Davelaar employed a dual-task interference methodology. This approach allows for the direct manipulation of executive demands by pairing a primary complex task with secondary tasks that tap specific elementary executive functions, thereby identifying shared processing resources through performance interference. The study comprised two experiments. Experiment 1 focused on Random Sequence Generation, a task requiring participants to produce a sequence of letters as randomly as possible. Participants performed this primary visual-manual task under four conditions: alone, and concurrently with three auditory-vocal secondary tasks designed to tap specific executive functions: a digit-switching task (set-shifting), a 2-back task (memory updating/monitoring), and a go-no-go task (response inhibition). The researchers measured various indices of randomness, including redundancy (equality of response usage) and stereotypy (frequency of specific response pairs). Experiment 2 utilized the Wisconsin Card Sorting Test as the primary task, coupled with the same secondary tasks, to determine which executive functions drive performance in this rule-shifting paradigm. In Experiment 1, results indicated that concurrent performance of the 2-back task (monitoring) and the digit-switching task (set-shifting) significantly impaired the randomness of the generated sequences compared to the control condition, whereas the go-no-go task (inhibition) had less impact on specific randomness measures. Specifically, the 2-back task significantly increased redundancy scores and altered bigram usage, suggesting that monitoring recent responses is critical for maintaining randomness. The authors interpret these findings through a verbal process model of random generation, where monitoring checks candidate responses against recent history; impairing this monitoring via the 2-back task disrupts the ability to suppress stereotyped sequences. The interference patterns observed differed from the predictions of Miyake et al.’s SEM models, which attributed randomness biases primarily to response inhibition and updating separately. The significance of these findings lies in the support for a decomposed view of the central executive, comprising multiple distinct functions rather than a single unitary system. The study demonstrates that dual-task interference can effectively fractionate executive processes, revealing that set-shifting and monitoring play differential and critical roles in complex tasks. By circumventing the statistical limitations of individual-differences methodologies, this research provides converging evidence that executive functions are separable and interact in specific ways during complex cognitive control, refining our understanding of the cognitive architecture underlying tasks like the WCST and random generation.

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Topics

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• executive function
• dual task multitasking
• dual task performance