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Related Experiment Videos

Evidence for task conflict in the Stroop effect.

Liat Goldfarb1, Avishai Henik

  • 1Department of Behavioral Sciences and Zlotowski Center for Neuroscience, Ben-Gurion University of the Negev, Beer Sheva, Israel. liatgol@bgu.ac.il

Journal of Experimental Psychology. Human Perception and Performance
|October 11, 2007
PubMed
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Congruent and incongruent stimuli activate the anterior cingulate cortex more, causing task conflict. This study found behavioral evidence for this, observing longer response times for congruent stimuli when task conflict was manipulated.

Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Experimental Psychology

Background:

  • Previous research suggests anterior cingulate cortex (ACC) activation correlates with task conflict from Stroop stimuli.
  • Congruent and incongruent stimuli may elicit greater ACC activation than neutral stimuli.

Purpose of the Study:

  • To investigate the behavioral expression of task conflict related to ACC activation patterns.
  • To examine how manipulating task conflict control influences behavioral responses to Stroop stimuli.

Main Methods:

  • Experiment 1 manipulated task conflict by altering the proportion of neutral stimuli and using cued/uncued trials.
  • Experiment 2 modified neutral stimuli to increase task conflict control.

Main Results:

Related Experiment Videos

  • Reduced task conflict control in Experiment 1 revealed a reverse facilitation effect: longer response times for congruent stimuli on uncued trials.
  • Response times were also longer for congruent stimuli when uncued compared to cued.
  • Increased task conflict control in Experiment 2 eliminated the observed task conflict expression.

Conclusions:

  • Behavioral evidence supports the link between ACC activation and task conflict in Stroop tasks.
  • Task conflict is behaviorally expressed and sensitive to manipulations in control mechanisms.