Chunking in Task Sequences Modulates Task Inhibition

Koch, Iring; Philipp, Andrea M.; Gade, Miriam · 2006 · OpenAlex-citations

DOI: 10.1111/j.1467-9280.2006.01709.x

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Summary

This study investigates how the formation of higher-order representations of task sequences influences task inhibition, a mechanism that suppresses competing tasks to prevent interference. While traditional task-switching research focuses on individual task performance, this work explores whether learning predictable sequences allows for "chunking"—grouping tasks into larger units—which might modulate the inhibitory processes typically associated with switching between tasks. Specifically, the authors examined whether explicit knowledge of a sequence facilitates this chunking and subsequently reduces the performance cost associated with repeating a task after one intervening task (n-2 repetition cost). The experiment involved 80 participants who performed three tasks (judging form, size, or color of stimuli) in either a predictable sequence (e.g., ABACBC) or a pseudorandom sequence. Participants were divided into two groups: an instructed-learning group, which was explicitly told the predictable sequence, and an incidental-learning group, which received no such instructions. Performance was measured via reaction times (RTs) and error rates. The study analyzed the "learning effect" (performance difference between predictable and random sequences) and the "inhibition effect" (performance difference between n-2 repetitions and nonrepetitions). Data from participants in the instructed group who could not verbally report the sequence were excluded from the primary analysis, leaving 16 instructed-aware participants and 40 incidental-learning participants. The results demonstrated that both groups exhibited significant sequence learning, indicated by faster RTs in predictable sequences compared to random ones. However, the impact on task inhibition differed markedly between groups. In the incidental-learning group, sequence learning did not significantly affect the n-2 repetition cost. In contrast, the instructed-aware group showed a substantial reduction in the inhibition effect within predictable sequences. Specifically, the n-2 repetition cost was 147 ms smaller in predictable sequences than in random sequences for the instructed group, whereas the difference was negligible (4 ms) for the incidental group. This interaction suggests that explicit sequence knowledge facilitates a chunking process where n-2 repetitions serve as chunk points, leading to within-chunk facilitation that overrides the typical inhibitory cost. The findings imply that executive control mechanisms operate at multiple levels. While task inhibition is likely tied to lower-level task-implementation processes, higher-order sequence representations formed through explicit chunking can modulate these effects. The study concludes that explicit instructions enable the formation of task chunks that selectively facilitate task goals associated with n-2 repetitions, thereby reducing inhibition costs. This highlights the importance of hierarchical task structures in understanding cognitive control, suggesting that tasks are rarely processed in isolation but rather as part of learned sequences.

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• task switching