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Related Experiment Videos

Switching of response modalities.

Andrea M Philipp1, Iring Koch

  • 1Max Planck Institute for Human Cognitive and Brain Sciences, Munich, Germany. philipp@cbs.mpg.de

The Quarterly Journal of Experimental Psychology. A, Human Experimental Psychology
|October 1, 2005
PubMed
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Task switching involves inhibiting previous tasks. This study shows that different response modalities, like vocal or finger responses, also cause task inhibition, impacting performance on subsequent trials.

Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Human Factors

Background:

  • Task switching research typically defines tasks by stimulus categorization.
  • Previous task engagement is assumed to inhibit the prior task, affecting subsequent performance.
  • The persistence of this inhibition, especially after an intervening trial, is a key area of study.

Purpose of the Study:

  • To investigate if different response modalities (vocal, finger, foot) can define tasks and induce inhibition.
  • To determine if task inhibition, defined by response modality, exhibits similar persistence as task inhibition defined by stimulus categorization.
  • To explore the n-2 repetition cost in the context of response modality task switching.

Main Methods:

  • Participants performed a digit categorization task (odd/even).

Related Experiment Videos

  • Task definition was varied using different response modalities (vocal, finger, foot) for different trials.
  • Reaction times and error rates were measured for ABA and CBA sequences.

    • Main Results:

    • ABA sequences (e.g., Vocal-Finger-Vocal) showed higher reaction times and error rates than CBA sequences (e.g., Vocal-Foot-Vocal).
    • This indicates a significant 'n-2 repetition cost', where repeating a task after one intervening trial incurs a performance penalty.
    • The results suggest that the task previously performed, even with a different response modality, is inhibited.

    Conclusions:

    • Response modalities can effectively define distinct tasks in cognitive paradigms.
    • Task inhibition, a key mechanism in task switching, operates similarly regardless of whether tasks are defined by stimulus categorization or response modality.
    • Persisting task inhibition, evidenced by the n-2 repetition cost, is a robust phenomenon in cognitive control.