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Related Experiment Videos

Mixing costs in task shifting reflect sequential processing stages in a multicomponent task.

Marco Steinhauser1, Ronald Hübner

  • 1Universität Konstanz, Fachbereich Psychologie, Konstanz, Germany. marco.steinhauser@uni-konstanz.de

Memory & Cognition
|April 18, 2006
PubMed
Summary
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Task shifting involves mixing costs that arise from selecting task components sequentially. This study demonstrates that these costs depend on the number of mixed components, not task sets, suggesting a stepwise selection strategy to reduce interference.

Area of Science:

  • Cognitive Psychology
  • Human Performance
  • Task Switching Research

Background:

  • Mixing costs in task shifting are hypothesized to reflect sequential selection of task components.
  • Previous research suggested mixing costs depend on the number of mixed task components.
  • Alternative explanations, like task set selection, were confounded with task components in prior studies.

Purpose of the Study:

  • To investigate whether mixing costs in task shifting are driven by the sequential selection of task components.
  • To differentiate between the task component selection account and the task set selection account for mixing costs.
  • To clarify the underlying mechanisms contributing to interference during task switching.

Main Methods:

  • Conducted three experiments manipulating the number of task sets and mixed task components independently.

Related Experiment Videos

  • Compared conditions where task set variation was constant while mixed components varied, and vice versa.
  • Analyzed the predictive power of the number of mixed task components on observed mixing costs.

    • Main Results:

    • The number of mixed task components, not the number of task sets, significantly predicted mixing costs.
    • Replicated the additivity of mixing costs across different levels of task component mixing (e.g., level and judgment).
    • Demonstrated that mixing costs are solely determined by the complexity of the task components being selected.

    Conclusions:

    • Mixing costs during task shifting primarily reflect a stepwise selection strategy of task components.
    • This selection process appears to reduce interference incrementally.
    • Findings support the sequential task component selection hypothesis over the task set selection account.