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Latent inhibition and contextual associations
Martha Escobar1, Francisco Arcediano, Ralph R Miller
1State University of New York at Binghamton, New York 13902-6000, USA.
Summary
Latent inhibition, or reduced response to a familiar stimulus, is caused by the strength of stimulus-context associations, not changes in stimulus associability. This finding challenges traditional views in associative learning.
Area of Science:
- Behavioral neuroscience
- Learning and memory
Background:
- Latent inhibition (LI) is traditionally explained by reduced stimulus (CS) associability after CS preexposure.
- An alternative account suggests interference from CS-context associations formed during preexposure.
Purpose of the Study:
- To experimentally contrast the stimulus associability and CS-context association accounts of latent inhibition.
- To investigate the role of CS-context associations in latent inhibition.
Main Methods:
- Three lick suppression experiments were conducted using rats.
- Varying the duration of context exposure relative to CS preexposure.
Main Results:
- Latent inhibition decreased with increased context exposure during or after CS preexposure.
- Latent inhibition increased with increased CS preexposure when the context-to-CS preexposure ratio was fixed.
- Results suggest context exposure attenuates CS-context associations.
Conclusions:
- Latent inhibition is directly influenced by the strength of CS-context associations formed during preexposure.
- This supports the CS-context interference account over the reduced CS associability account.