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Jesús Alonso-Vega1,2, María Xesús Froxán-Parga2, Erik Arntzen3

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This study explored stimulus equivalence in adults with severe mental disorders. The simple-to-complex protocol improved equivalence class formation compared to simultaneous testing.

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Area of Science:

  • Behavioral Psychology
  • Clinical Psychology
  • Cognitive Science

Background:

  • Stimulus equivalence is linked to complex human behaviors like memory and symbolic reasoning.
  • Cognitive impairments are common in severe mental disorders, affecting processing speed and problem-solving.
  • Limited research exists on stimulus equivalence performance in individuals with severe mental disorders.

Purpose of the Study:

  • To investigate stimulus equivalence formation in adults diagnosed with severe mental disorders.
  • To analyze the effects of many-to-one (MTO) and one-to-many (OTM) training structures.
  • To examine the impact of simultaneous (SIM) and simple-to-complex (STC) training/testing protocols on equivalence class formation.

Main Methods:

  • Evaluated 18 participants with severe mental disorders across three conditions: OTM/SIM, MTO/SIM, and MTO/STC.
  • Assessed behavior consistent with stimulus equivalence formation.
  • Compared the efficacy of different training structures and testing protocols.

Main Results:

  • Behavior consistent with stimulus equivalence was observed in 11 of 13 completers.
  • The simple-to-complex (STC) protocol demonstrated superior results compared to the simultaneous (SIM) protocol.
  • No significant differences were found between many-to-one (MTO) and one-to-many (OTM) training structures.

Conclusions:

  • Stimulus equivalence can be formed by adults with severe mental disorders.
  • The simple-to-complex training and testing protocol is more effective for this population.
  • Further research is needed to explore implications and refine methodologies.