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Related Experiment Videos

Event-related potentials to Stroop and reverse Stroop stimuli.

Carmen M Atkinson1, Karen A Drysdale, W R Fulham

  • 1School of Behavioural Sciences, University of Newcastle, University Drive, Callaghan 2308, NSW, Australia. carmen.atkinson@newcastle.edu.au

International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology
|January 25, 2003
PubMed
Summary

The Stroop task reveals processing differences between color perception and word meaning. This study used reaction time and event-related potentials to show that Stroop interference occurs late in processing, involving semantic selection and output stages.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience

Background:

  • The Stroop task demonstrates interference between congruent and incongruent color-words.
  • A debate exists regarding whether Stroop effects arise from early processing or later response competition.

Purpose of the Study:

  • To investigate the temporal dynamics of Stroop interference using reaction time and event-related potentials.
  • To examine the less-established 'reverse Stroop' effect.

Main Methods:

  • Employed the standard Stroop task and the reverse Stroop task.
  • Utilized reaction time (RT) measurements.
  • Recorded event-related potentials (ERPs), including N100 and P100 components, and late lateralized negativity.

Main Results:

Related Experiment Videos

  • Both standard and reverse Stroop interference effects were observed.
  • Early ERP components (N100, P100) showed differences between congruent and incongruent trials in the reverse Stroop, suggesting early perception of physical mismatch.
  • A late lateralized negativity was enhanced for incongruent trials and the reverse Stroop task, indicating late semantic selection and rechecking.

    • Conclusions:

    • Stroop interference arises at the output stage of processing, not during initial stimulus perception.
    • Stimuli in the Stroop task are processed in parallel across a network of brain areas.
    • ERP data supports distinct temporal processing for standard and reverse Stroop effects.