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Contextual dependencies in a stimulus equivalence paradigm
P Dibbets1, J H R Maes, J M H Vossen
1NICI/Department of Comparative & Physiological Psychology, University of Nijmegen, The Netherlands. dibbets@nici.kun.nl
Summary
Contextual cues influence human learning in stimulus equivalence tasks. A context change only increased response times on complex equivalence trials, not simpler baseline or symmetry trials.
Area of Science:
- Cognitive Psychology
- Behavioral Science
Background:
- Stimulus equivalence paradigms investigate learned stimulus relations.
- Contextual cues can influence behavior, but their impact across different task complexities is not fully understood.
Purpose of the Study:
- To investigate the role of contextual dependencies in stimulus equivalence.
- To determine if task complexity moderates the effect of context changes on performance.
Main Methods:
- Two experiments used matching-to-sample procedures with human subjects.
- Contextual cues (background colors) were manipulated during training and testing.
- Performance was assessed across baseline, symmetry, and equivalence trials under different context conditions.
Main Results:
- A change in context significantly increased response latency on equivalence trials.
- No significant effects of context change were observed on baseline or symmetry trials.
- Results suggest context-dependent effects are linked to task complexity.
Conclusions:
- Contextual dependencies exert a greater influence on more complex cognitive tasks.
- Findings align with theories of switch costs and habituation to contextual stimuli.
- A model explaining differential context switch effects based on task difficulty is supported.
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