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Proactive versus reactive task-set inhibition: evidence from flanker compatibility effects.

David Kuhns1, Mei-Ching Lien, Eric Ruthruff

  • 1Oregon State University, Corvallis, Oregon 97331, USA.

Psychonomic Bulletin & Review
|December 20, 2007
PubMed
Summary

People proactively inhibit recently performed tasks when switching to new tasks. This proactive inhibition reduces interference from abandoned tasks, aiding cognitive flexibility.

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Area of Science:

  • Cognitive psychology
  • Neuroscience
  • Human behavior

Background:

  • Task switching is a fundamental cognitive process.
  • Understanding proactive inhibition is key to explaining cognitive control.
  • Previous research yielded mixed results on proactive task inhibition.

Purpose of the Study:

  • To investigate proactive inhibition of recently performed tasks during task switching.
  • To determine if cognitive inhibition declines across trials.
  • To examine the role of incentives in promoting task-set inhibition.

Main Methods:

  • A task-cuing paradigm was employed.
  • Flanker interference was measured for tasks performed on the immediately preceding trial (lag 1) versus more distant trials (lag 2+).
  • Experiment 2 modified incentives to encourage task-set inhibition.

Main Results:

  • Experiment 1 did not confirm the prediction of reduced flanker interference at lag 1.
  • Experiment 2 confirmed the prediction, showing smaller flanker interference at lag 1.
  • Results indicate proactive inhibition is utilized to minimize interference from prior tasks.

Conclusions:

  • Evidence supports the proactive inhibition of recently performed tasks during cognitive switching.
  • Incentives may enhance the effectiveness of proactive task-set inhibition.
  • Proactive inhibition contributes to efficient cognitive control and task performance.