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Extending continuous versus discontinuous conditioned stimuli before versus after unconditioned stimuli
M Albert1, S Ricker, R A Bevins
1Department of Psychology, Concordia College, Amherst, Massachusetts.
Summary
Extending conditioned stimuli (CSs) before unconditioned stimuli (US) weakened conditioning more than extending CSs after the US. Temporal gaps did not affect B extensions but weakened A extensions in this rat study.
Area of Science:
- Behavioral neuroscience
- Learning and memory
Background:
- Conditioned suppression is a key paradigm for studying associative learning.
- Understanding how the timing and extension of conditioned stimuli (CSs) impact associative strength is crucial.
Purpose of the Study:
- To investigate the impact of extending conditioned stimuli (CSs) before (B extensions) versus after (A extensions) unconditioned stimuli (US) on conditioning.
- To examine the role of temporal gaps within these CS extensions.
Main Methods:
- Rats were trained using a conditioned suppression paradigm.
- Within-group designs compared B and A extensions with and without 6-min temporal gaps between 2-min CS segments.
Main Results:
- B extensions significantly weakened conditioning compared to A extensions, irrespective of temporal gaps.
- This asymmetry persisted with extended training.
- Temporal gaps within A extensions weakened conditioning, while gaps within B extensions had no detectable effect.
Conclusions:
- The findings suggest an asymmetry in how CS extensions affect conditioning, with pre-US extensions being more disruptive.
- The results are better explained by the Sometimes Opponent-Process (SOP) model than the Rescorla-Wagner-Frey-Sears real-time model.