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Updated: Jun 24, 2026
10:14
Whisker-signaled Eyeblink Classical Conditioning in Head-fixed Mice
Published on: March 30, 2016
Is Perruchet's dissociation between eyeblink conditioned responding and outcome expectancy evidence for two learning
Gabrielle Weidemann1, Jason M Tangen, Peter F Lovibond
1School of Psychology, University of New South Wales, Sydney, New South Wales, Australia. G.Weidemann@unsw.edu.au
Summary
Human eyeblink conditioning reveals the Perruchet effect, where conditioned responses (CRs) and expectancy diverge. This study rules out US sensitization and timing as causes, challenging single-process learning models.
Area of Science:
- Cognitive Psychology
- Behavioral Neuroscience
- Learning and Memory
Background:
- The Perruchet effect demonstrates a dissociation between conditioned responses (CRs) and expectancy in human eyeblink conditioning.
- Participants exhibit opposing trends in CRs and expectancy across reinforced and non-reinforced trial blocks under partial reinforcement.
Purpose of the Study:
- To investigate the underlying mechanisms of the linear trend in conditioned responses (CRs) observed in the Perruchet effect.
- To determine if US sensitization, changes in associative strength, or precise CS-US interval learning explain the Perruchet effect.
Main Methods:
- Three experiments using human eyeblink conditioning were conducted.
- Experiments 1 and 2 assessed the role of unconditioned stimulus (US) sensitization.
- Experiment 3 manipulated the conditioned stimulus-unconditioned stimulus (CS-US) interval (fixed vs. variable).
Main Results:
- The linear trend in eyeblink CRs was not attributable to US sensitization.
- The linear trend persisted regardless of whether the CS-US interval was fixed or variable.
- Results challenge models where expectancy solely mediates CRs.
Conclusions:
- US sensitization and learning the precise CS-US timing do not explain the Perruchet effect's linear CR trend.
- Findings suggest limitations of single-process associative learning models in explaining the dissociation between CRs and expectancy.
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