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Related Experiment Video

Updated: Jan 22, 2026

The 5-Choice Serial Reaction Time Task: A Task of Attention and Impulse Control for Rodents
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Task duration and task order do not matter: no effect on self-control performance.

Wanja Wolff1,2, Vanda Sieber3, Maik Bieleke4,5

  • 1Institute of Sport Sciences, University of Konstanz, Universitätsstraße 10, Konstanz, 78464, Germany. wanja.wolff@uni-konstanz.de.

Psychological Research
|July 20, 2019
PubMed
Summary
This summary is machine-generated.

The ego depletion effect, where self-control exertion impairs subsequent performance, was not supported in this study. Task duration and type did not influence self-control performance, challenging the strength model of self-control.

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Area of Science:

  • Psychology
  • Cognitive Science
  • Social Psychology

Background:

  • The strength model of self-control posits a limited resource depleted by exertion, leading to ego depletion.
  • Replication failures challenge the existence of the ego depletion effect.
  • Conflicting literature necessitates investigation into factors like task variation.

Purpose of the Study:

  • To investigate between-task and within-task variations as explanations for inconsistent ego depletion findings.
  • To examine how self-control task duration influences ego depletion.
  • To test the strength model of self-control under varied task conditions.

Main Methods:

  • A high-powered experiment with 709 participants.
  • Utilized two established self-control tasks: the Stroop task and a transcription task.
  • Manipulated primary and secondary task durations (2, 4, 8, or 16 minutes).

Main Results:

  • Participants perceived longer secondary tasks as more demanding, aligning with ego depletion expectations.
  • No evidence of impaired performance due to prior self-control exertion was found.
  • Performance did not decrease with task duration; it tended to improve with longer primary task durations.
  • Observed null findings were independent of the specific self-control task used.

Conclusions:

  • The study failed to find evidence supporting the ego depletion effect.
  • Task duration and type do not appear to be critical moderators of ego depletion.
  • Findings challenge the strength model's premise of a global, limited resource for self-control.