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The relation between stimulus function and equivalence class formation.

Ian T Tyndall1, Bryan Roche, Jack E James

  • 1National University of Ireland, Galway, Department of Psychology. Ian.Tyndall@nuigalway.ie

Journal of the Experimental Analysis of Behavior
|September 11, 2004
PubMed
Summary

Stimulus equivalence formation is slower when stimuli share similar functions or are novel. The number of established similar stimulus functions also impacts acquisition speed, influencing how equivalence relations emerge.

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Area of Science:

  • Behavioral Psychology
  • Learning Sciences
  • Cognitive Science

Background:

  • Stimulus equivalence is a fundamental concept in behavior analysis, referring to the emergence of untrained relations between stimuli.
  • Understanding factors that influence the formation of stimulus equivalence is crucial for applied behavior analysis and education.

Purpose of the Study:

  • To investigate how the functional properties of stimuli affect the acquisition of stimulus equivalence.
  • To examine the impact of stimulus similarity and novelty on the number of trials required for equivalence formation.

Main Methods:

  • Fifty participants underwent discrimination training to establish positive (S+) and negative (S-) stimulus functions.
  • Participants were then assigned to one of five conditions involving stimulus equivalence training and testing with varying combinations of S+ and S- stimuli.

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  • A control group used stimuli without established functions.

    • Main Results:

    • Fewer testing trials were needed to establish equivalence relations when stimuli were functionally different compared to functionally similar.
    • Novel arbitrary stimuli required more test trials for equivalence formation than functionally distinct stimuli.
    • The speed of stimulus equivalence acquisition was influenced by the number of pre-established functionally similar stimuli.

    Conclusions:

    • The functional class of stimuli significantly impacts the emergence and acquisition of stimulus equivalence relations.
    • Stimulus similarity and novelty are key factors that can impede or facilitate equivalence formation.
    • These findings have implications for designing effective training procedures in educational and therapeutic settings.