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Chunking away task-switch costs: a test of the chunk-point hypothesis

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Abstract

Previous research has revealed that task-switch costs (worse performance for task switches than for task repetitions) at the first position of an explicit task sequence are eliminated or reduced when repeating or switching sequences. The authors hypothesize that such effects are restricted to points in the sequence representation that are associated with sequence-level processing such as chunk retrieval that changes the contents of working memory. In an experiment testing this chunk-point hypothesis, subjects memorized and performed explicit task sequences under different chunking instructions that induced chunk points at different positions within the sequences. Regardless of position, performance was slower at chunk points than at non-chunk points, providing direct evidence of chunking, and task-switch costs were reduced or eliminated at chunk points while they remained large and robust at non-chunk points. These findings support the chunk-point hypothesis and are discussed in relation to task-set inhibition and associative interference.

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Acknowledgements

This research was supported by National Institute of Mental Health Grant R01-MH073879-01 and National Science Foundation Grant BCS 0646588 to Gordon D. Logan. We thank Julie Delheimer for running the experiment. We also thank Iring Koch, Roy Luria, Nachshon Meiran, and Andrea Philipp for comments on previous versions of this article.

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Correspondence to Darryl W. Schneider.

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Schneider, D.W., Logan, G.D. Chunking away task-switch costs: a test of the chunk-point hypothesis. Psychon Bull Rev 22, 884–889 (2015). https://doi.org/10.3758/s13423-014-0721-3

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  • DOI: https://doi.org/10.3758/s13423-014-0721-3

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