Correlations among stimuli affect stimulus matching and stimulus liking

Area of Science:

• Behavioral psychology
• Cognitive science
• Stimulus-response learning

Background:

• Stimulus equivalence is a fundamental concept in behavioral psychology, demonstrating how arbitrary relations can be learned.
• Previous research has established the emergence of stimulus equivalence through various training paradigms.
• Understanding the affective (liking) dimensions associated with learned stimulus relations is crucial for a comprehensive view of behavior.

Purpose of the Study:

• To investigate the emergence of stimulus equivalence (B-A, C-A, B-C, C-B) after exposure to AB and AC stimulus pairs.
• To examine how exposure to AB and AC pairs influences the attractiveness ratings of derived stimulus compounds (BA, CA, BC, CB).
• To explore the relationship between learned stimulus correlations, emergent equivalence, and affective responses.

Main Methods:

• Human participants were exposed to paired stimuli (AB, AC).
• Participants then completed matching-to-sample tasks to test for emergent stimulus equivalence (e.g., B-A, C-A).
• A separate group rated the attractiveness of stimulus compounds (e.g., BA, CA, BC, CB).

Main Results:

• Matching-to-sample tests confirmed the emergence of all tested stimulus equivalence relations (B-A, C-A, B-C, C-B).
• The proportion of correct emergent choices increased with greater exposure to the initial AB, AC pairs.
• Attractiveness ratings for all stimulus compounds generally increased with exposure, but BC and CB compounds showed negative liking scores after limited exposure.

Conclusions:

• Exposure to correlated stimulus pairs leads to both the emergence of stimulus equivalence and changes in affective evaluations.
• Learned stimulus correlations can establish complex associative structures that influence both cognitive and affective responses.
• The findings support both perceptual and associative accounts of how stimulus correlations shape behavior and evaluation.