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Related Experiment Videos

Similarity, confusability, and the density hypothesis.

J E Corter

    Journal of Experimental Psychology. General
    |September 1, 1987
    PubMed
    Summary

    Stimulus density influences item identification but not psychological similarity. This study manipulated density in six experiments, finding no effect on similarity or discrimination, but an impact on identification response probabilities.

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    Area of Science:

    • Cognitive Psychology
    • Psychophysics

    Background:

    • Previous research suggested psychological similarity is influenced by stimulus density.
    • This hypothesis was questioned due to a lack of direct density manipulation in prior studies.

    Purpose of the Study:

    • To investigate the direct effect of stimulus density on psychological similarity and identification performance.
    • To differentiate the roles of density in similarity judgments versus identification tasks.

    Main Methods:

    • Six experiments were conducted, manipulating stimulus density.
    • Methods included similarity ratings, discrimination confusions, and identification tasks.

    Main Results:

    • No significant effect of stimulus density was found on similarity ratings or discrimination confusions.
    • Identification performance, specifically response probabilities, was affected by stimulus density in one experiment.

    Conclusions:

    • Stimulus density impacts the choice process in identification tasks.
    • Stimulus density is not a primary determinant of psychological similarity.

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