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Related Experiment Videos

Locus of interference on the Stroop test

D D Wheeler

    Perceptual and Motor Skills
    |August 1, 1977
    PubMed
    Summary
    This summary is machine-generated.

    The Stroop test reveals verbal response interference. Finger responses eliminated this interference, suggesting the Stroop effect originates in verbal processing, not visual perception.

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    Area of Science:

    • Cognitive Psychology
    • Neuroscience

    Background:

    • The Stroop test is a classic experiment demonstrating cognitive interference.
    • It typically involves naming the ink color of a word that denotes a different color.

    Purpose of the Study:

    • To investigate the origin of the Stroop effect.
    • To determine if the interference is related to verbal response processing or visual perception.

    Main Methods:

    • 36 college students participated.
    • Participants completed the Stroop task using verbal responses (reading words, naming ink colors).
    • Participants also completed the task using manual (finger push button) responses.

    Main Results:

    • Verbal responses showed the typical Stroop effect: naming ink colors took nearly twice as long as reading words.

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  • Manual responses (left or right hand) showed no difference in time between reading words and naming ink colors.
  • The Stroop effect disappeared with manual responses.

    • Conclusions:

    • The Stroop effect primarily arises from interference during verbal response selection.
    • This suggests that the interference is not solely based on visual perception but involves higher-level cognitive processing related to language output.