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Maintained nodal-distance effects in equivalence classes.

L Fields, D V Landon-Jimenez, D M Buffington

    Journal of the Experimental Analysis of Behavior
    |September 1, 1995
    PubMed
    Summary
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    This study on stimulus relations found that the emergence of untrained relations and class-appropriate responding decreased as the "nodal distance" between stimuli increased. Ordered training may facilitate equivalence class formation.

    Area of Science:

    • Behavioral psychology
    • Stimulus equivalence
    • Transitivity

    Background:

    • Equivalence classes are formed when stimuli are related through training.
    • Nodal distance, the number of intermediate stimuli, may influence the emergence of untrained relations.

    Purpose of the Study:

    • To investigate the effect of nodal distance on the emergence of untrained stimulus relations.
    • To examine how nodal distance influences class-appropriate responding and reaction times in a response-transfer test.
    • To explore whether ordered, sequential exposure to stimulus relations facilitates equivalence class formation.

    Main Methods:

    • Twelve subjects were trained on a series of AB, BC, CD, and DE stimulus relations.
    • Probe trials tested for emergent relations, categorized by nodal distance.

    Related Experiment Videos

  • A response-transfer test assessed if stimuli evoked trained responses within equivalence classes.

    • Main Results:

    • Class-appropriate responding was an inverse function of nodal distance for all subjects.
    • Performance on trained relations was disrupted by probe trials.
    • In a response-transfer test, stimuli evoked class-appropriate responses, inversely related to nodal distance, with reaction times showing an inverted U-shaped function.

    Conclusions:

    • Nodal distance significantly impacts the emergence of untrained relations and class-appropriate responding.
    • Ordered, sequential stimulus relation exposure may be crucial for developing equivalence classes.
    • The relatedness of stimuli within an equivalence class appears to be a stable inverse function of nodal distance.