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Merging separately established stimulus classes with outcome-specific reinforcement.

Cammarie Johnson1, Olga Meleshkevich, William V Dube

  • 1Western New England University, New England Center for Children.

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|November 20, 2013
PubMed
Summary
This summary is machine-generated.

This study shows that stimulus classes can merge, forming larger equivalence classes. This merging was achieved using outcome-specific reinforcers, demonstrating complex learning in adults.

Keywords:
Stimulus equivalenceclass mergerconditional discriminationhumansmatch to samplemouse clickoutcome-specific reinforcement

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Area of Science:

  • Behavioral Psychology
  • Learning and Cognition

Background:

  • Equivalence relations are key to understanding complex cognition.
  • Previous research focused on outcome-specific reinforcers for establishing stimulus classes.

Purpose of the Study:

  • To investigate the merger of separately established stimulus classes using outcome-specific reinforcers.
  • To demonstrate the formation of larger equivalence classes with multiple stimuli.

Main Methods:

  • Conditional discriminations were trained with outcome-specific reinforcers (gift card value).
  • Equivalence tests were conducted for initial three-member classes (ABC and DEF).
  • Class merger tests combined stimuli from established classes, with reinforcers acting as nodes.

Main Results:

  • Two participants immediately formed eight-member equivalence classes (ABCDEF).
  • A third participant formed classes after brief exposure to unreinforced probe trials.
  • The fourth participant did not demonstrate class merger.
  • Post-merger tests confirmed stimulus-reinforcer matching.

Conclusions:

  • Demonstrates the successful merger of stimulus classes into larger equivalence classes.
  • Highlights the role of outcome-specific reinforcers in complex stimulus class formation.
  • Provides the first evidence of eight-member equivalence classes with conditioned reinforcing stimuli.