The Stroop phenomenon: perceptual conflict or response competition?

Area of Science:

• Cognitive Psychology
• Experimental Psychology

Background:

• The Stroop phenomenon is a well-known cognitive task demonstrating interference in reaction time.
• Two primary theoretical explanations exist: perceptual conflict and response competition.

Purpose of the Study:

• To empirically differentiate between the perceptual conflict and response competition hypotheses of the Stroop effect.
• To assess the impact of delayed auditory feedback on Stroop performance.

Main Methods:

• Twenty-four undergraduate students participated in the study.
• Participants completed Stroop tasks under conditions of delayed auditory feedback and normal feedback.
• Verbal responses were monitored during task performance.

Main Results:

• Delayed auditory feedback led to significant differences in response decrements across various Stroop conditions.
• The observed pattern of decrements aligned with the predictions of the response-competition model.
• The results did not support the predictions derived from the perceptual-conflict model.

Conclusions:

• The findings provide strong evidence supporting the response-competition hypothesis as an explanation for the Stroop phenomenon.
• The perceptual-conflict hypothesis was disconfirmed by the experimental results.
• Delayed auditory feedback serves as a valuable manipulation for distinguishing between competing cognitive theories.