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Does switching between strategies within the same task involve a cost?

Koen Luwel1, Viki Schillemans, Patrick Onghena

  • 1Katholieke Universiteit Leuven, Leuven, Belgium. Koen.Luwel@ped.kuleuven.be

British Journal of Psychology (London, England : 1953)
|February 26, 2009
PubMed
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Switching between cognitive strategies incurs a performance cost, demonstrated by increased response times without affecting accuracy. This cognitive cost in strategy switching is independent of strategy complexity.

Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Human Behavior

Background:

  • Task switching paradigms investigate the cognitive mechanisms underlying the ability to disengage from one task and engage with another.
  • Understanding the costs associated with switching between different cognitive strategies is crucial for optimizing performance in complex environments.

Purpose of the Study:

  • To investigate the cognitive cost of switching between two distinct cognitive strategies.
  • To examine how strategy complexity and stimulus type (bivalent vs. univalent) influence this cognitive cost.
  • To evaluate the implications of the findings for existing theories of task switching.

Main Methods:

  • Two experiments were conducted using a numerosity judgment task.
  • Participants regularly switched between two cognitive strategies of varying complexity.

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  • Experiment 1 used bivalent stimuli, while Experiment 2 used univalent stimuli.

    • Main Results:

    • Switching between cognitive strategies resulted in a significant cognitive cost, evidenced by longer response times on switch trials compared to non-switch trials.
    • Accuracy remained unaffected by the strategy switching manipulation.
    • The magnitude of the switch cost was not dependent on strategy complexity but decreased when a strategy was more suitable for the task.

    Conclusions:

    • Task switching between cognitive strategies incurs a measurable performance cost, primarily in terms of reaction time.
    • Current task switching theories may need refinement to fully account for strategy-specific costs and the influence of stimulus properties.
    • The findings highlight the adaptive nature of cognitive control in managing strategy selection and execution.