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Reexamining nodality in equivalence classes
Gabriel Chand1, Timothy L Edwards1
1School of Psychology, University of Waikato.
Journal of the Experimental Analysis of Behavior
|September 2, 2022
Summary
Nodality, the reduced functional similarity between stimuli with more intervening nodes, was confirmed in a controlled experiment. Participants showed preference for stimuli closer in the equivalence class, supporting nodality as a robust phenomenon.
Area of Science:
- Behavioral psychology
- Stimulus equivalence research
Background:
- Equivalence classes demonstrate functional similarity between stimuli.
- Nodality describes how similarity decreases with more intervening stimuli (nodes).
- Previous studies lacked simultaneous control over priming, reinforcement, and stimulus functions.
Purpose of the Study:
- To investigate nodality under controlled conditions.
- To establish two 6-member, 4-node equivalence classes.
- To evaluate nodality using a within-class preference assessment.
Main Methods:
- Controlled for priming effects, reinforcement during training, and multiple stimulus functions.
- Established two 6-member, 4-node equivalence classes.
- Administered a within-class preference assessment to evaluate nodality.
Main Results:
- Five of 12 participants achieved criterion accuracy.
- Participants demonstrated nodality, preferring nodally proximal stimuli.
- Selection time increased for nodally distal stimuli compared to proximal ones.
Conclusions:
- Nodality is a robust phenomenon, not an artifact of uncontrolled factors.
- Findings align with previous research on nodality.
- Controlled experimental conditions strengthen the evidence for nodality.
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