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Related Experiment Videos

Task shifting in dual-task settings.

Shulan Hsieh1

  • 1Department of Psychology, National Chung Cheng University, Ming-Hsuing, Chia-Yi, Taiwan. psyhsl@ccunix.ccu.edu.tw

Perceptual and Motor Skills
|May 25, 2002
PubMed
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Performing two tasks at once increases the time needed to switch between them, suggesting task switching involves a limited resource. This dual-task interference highlights competition in cognitive control.

Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Human Factors

Background:

  • Task switching incurs a 'shift cost', slowing reaction times compared to repeating tasks.
  • This cost is theorized to reflect the limited capacity of a central executive controlling task performance.

Purpose of the Study:

  • To investigate the impact of dual-tasking on the magnitude of task-switching costs.
  • To test the hypothesis that a single central executive underlies task shifting.

Main Methods:

  • Participants performed a rule-shifting task concurrently with a subtracting task (dual-task condition).
  • Reaction times were measured and compared to single-task conditions.

Main Results:

  • Concurrent subtracting significantly interfered with the rule-shifting task.

Related Experiment Videos

  • An over-additive increase in time cost was observed for task set shifting under dual-task conditions.

    • Conclusions:

    • Dual-tasking exacerbates task-switching costs, supporting the idea of limited cognitive resources.
    • Interference likely stems from competition between the activation of different task rules within the cognitive system.