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Task-set inhibition in chunked task sequences.

Darryl W Schneider1

  • 1Department of Psychology, Vanderbilt University, Nashville, Tennessee 37203, USA. darryl.schneider@vanderbilt.edu

Psychonomic Bulletin & Review
|December 20, 2007
PubMed
Summary
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Chunking sequences reduces task-set inhibition costs. Within-chunk repetitions, unlike between-chunk ones, lessen the n-2 repetition cost, suggesting task goal priming.

Area of Science:

  • Cognitive psychology
  • Neuroscience
  • Human self-control

Background:

  • Understanding self-control requires examining hierarchical representations.
  • Task-set inhibition influences task sequence performance.
  • Chunking (sequence-level) and task-set inhibition (task-level) interact.

Purpose of the Study:

  • Investigate the relationship between chunking and task-set inhibition.
  • Test if within-chunk facilitation reduces the n-2 repetition cost.
  • Evaluate the role of task goal priming versus direct modulation of inhibition.

Main Methods:

  • Experimentally induced sequence chunking in participants.
  • Varied n-2 task repetitions to occur within or between chunks.
  • Measured n-2 repetition cost (performance differences).

Related Experiment Videos

Main Results:

  • Confirmed direct evidence of chunking behavior.
  • Observed a smaller n-2 repetition cost for within-chunk repetitions compared to between-chunk repetitions.
  • Demonstrated that chunking impacts task-set inhibition effects.

Conclusions:

  • Findings support an elaborated hypothesis.
  • Reduction in n-2 repetition cost is attributed to task goal priming.
  • Task goal priming, not direct inhibition modulation, explains reduced costs.