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Modulation of conflicts in the Stroop effect.

Ido Shichel1, Joseph Tzelgov2

  • 1Department of Brain and Cognitive Sciences, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel; Zlotowski Center for Neuroscience, Ben-Gurion University of the Negev, Beer Sheva 84105, Israel.

Acta Psychologica
|October 29, 2017
PubMed
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This study reveals task and semantic conflicts contribute to the Stroop effect and are modulated by neutral trials, unlike response conflict. These findings support the conflict monitoring model for task and semantic conflicts.

Area of Science:

  • Cognitive Psychology
  • Neuroscience

Background:

  • The Stroop effect, a common measure of cognitive control, involves interference in reaction time.
  • Understanding the distinct components of conflict within the Stroop task is crucial for elucidating cognitive control mechanisms.

Purpose of the Study:

  • To isolate and quantify the unique contributions of task, semantic, and response conflicts to the Stroop effect.
  • To investigate how manipulating the proportion of neutral trials affects these conflict types and the overall Stroop effect.

Main Methods:

  • Utilized a two-to-one paradigm with neutral illegible stimuli and varied color-word combinations.
  • Implemented four congruency conditions (neutral, congruent, two incongruent types) to decompose the Stroop effect into orthogonal conflicts.
  • Manipulated the proportion of neutral trials across experiments.
Keywords:
AutomaticityConflict monitoringResponse conflictSemantic conflictStroop effectTask conflict

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Main Results:

  • All three conflict types (task, semantic, response) were found to contribute to the Stroop effect.
  • Task and semantic conflicts were modulated by the proportion of neutral trials, whereas response conflict was not.
  • Orthogonal comparisons provided a clearer estimation of unique conflict contributions compared to traditional methods.

Conclusions:

  • Task and semantic conflicts appear to be integral components of the Stroop effect's control loop, aligning with the conflict monitoring model.
  • Response conflict does not show evidence of being part of this control loop.
  • The orthogonal comparisons approach offers a valuable method for analyzing conflict modulation in cognitive tasks.