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Updated: Sep 28, 2025
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Aversive Associative Learning and Memory Formation by Pairing Two Chemicals in Caenorhabditis elegans
Published on: June 23, 2022
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Acquisition learning is stronger for aversive than appetitive events
Marieke E van der Schaaf1,2, Katharina Schmidt3, Jaspreet Kaur4
1Radboud University Medical Centre, Department of Psychiatry, 6525 GA, Nijmegen, The Netherlands.
Communications Biology
|April 5, 2022
Summary
Humans more readily learn to fear negative stimuli than to anticipate positive ones. This aversive learning bias, observed in pain studies, may contribute to anxiety and depression.
Area of Science:
- Neuroscience
- Behavioral Science
- Pain Research
Background:
- Adaptive behavior relies on both appetitive and aversive learning.
- Limited understanding exists regarding the differences between these learning types.
Purpose of the Study:
- To directly compare the acquisition and extinction of conditioned stimuli predicting pain exacerbation versus relief.
- To investigate the neural and psychological underpinnings of differential learning.
Main Methods:
- Utilized a capsaicin heat pain model in 36 healthy participants.
- Measured valence ratings, skin conductance responses, and contingency ratings.
- Compared learning and extinction phases for aversive and appetitive cues.
Main Results:
- Aversive learning showed significantly stronger acquisition than appetitive learning.
- No significant differences were found in the extinction of aversive versus appetitive cues.
- Results were independent of individual pain sensitivity and psychological factors.
Conclusions:
- Findings suggest an evolutionarily ingrained bias towards acquiring aversive cues for survival.
- This aversive learning predisposition may play a role in the development of clinical conditions like chronic pain, depression, and anxiety disorders.
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