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Related Experiment Videos

P300 and response time from a manual Stroop task.

A B Ilan1, J Polich

  • 1Department of Neuropharmacology TPC-10, The Scripps Research Institute, La Jolla, CA 92037, USA. aarm@eeg.com

Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology
|April 22, 1999
PubMed
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Manual response time and P300 event-related potential (ERP) measures in a Stroop task show that interference and facilitation stem from response competition, regardless of stimulus-response mapping.

Area of Science:

  • Cognitive psychology
  • Neuroscience

Background:

  • The Stroop task is a classic method for studying cognitive interference.
  • Previous studies using vocal responses have shown effects on response time (RT) and P300 event-related potentials (ERPs).

Purpose of the Study:

  • To investigate if manual responses in a Stroop task with an arbitrary stimulus-response (S-R) mapping yield similar results to vocal responses.
  • To determine the origin of Stroop effects by analyzing RT and P300 latency.

Main Methods:

  • Thirty-two subjects performed a manual Stroop color naming task.
  • Stimuli involved color words presented in congruent, neutral, or incongruent display colors.
  • Response time (RT) and P300 event-related potential (ERP) were recorded.

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Main Results:

  • Stroop facilitation and interference effects were observed in RT, with shortest RT for congruent and longest for incongruent conditions.
  • P300 latency did not differ across congruence conditions.
  • RT differences suggest post-stimulus evaluation processing.

Conclusions:

  • Manual RT/P300 findings support response competition as the source of Stroop interference and facilitation.
  • The results indicate that Stroop effects on RT and P300 are independent of the S-R translation type.