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When two actions are easier than one: how inhibitory control demands affect response processing.

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Summary

Performing multiple actions can incur costs, but highly automatic responses like eye movements (saccades) can lead to worse single-task performance. Inhibiting automatic saccades is more demanding than executing them.

Keywords:
Dual-response benefitsDual-task performanceExecutive controlEye movementsGap effectSaccade inhibition

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Human Performance

Background:

  • Simultaneous action execution typically results in performance costs.
  • Automatic responses, such as saccadic eye movements, are often difficult to inhibit.

Purpose of the Study:

  • To investigate the impact of response automaticity on single-task versus dual-task performance.
  • To examine the role of response inhibition in dual-choice tasks involving automatic responses.

Main Methods:

  • Participants performed eye movements (saccades) and/or manual key presses in response to visual stimuli.
  • Saccade automaticity was manipulated using a gap paradigm (gap vs. overlap conditions).
  • Performance errors were compared between single-response and dual-response conditions.

Main Results:

  • Single-response conditions showed higher error rates than dual-response conditions, indicating a dual-response benefit.
  • This benefit was particularly pronounced in the gap condition, where saccade automaticity was higher.
  • Difficulties in inhibiting automatic saccades during manual-only responses contributed to increased errors.

Conclusions:

  • Response inhibition, particularly for automatic actions like saccades, can be more resource-demanding than response execution.
  • Dual-task performance can sometimes exceed single-task performance when automatic responses are involved.
  • Findings highlight the complex interplay between automaticity, inhibition, and cognitive control in action selection.