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Related Experiment Videos

The CS-US interval and taste aversion learning: a brief look

G E Schafe1, S I Sollars, I L Bernstein

  • 1Department of Psychology, University of Washington, Seattle 98195, USA.

Behavioral Neuroscience
|August 1, 1995
PubMed
Summary

Conditioned taste aversion learning requires longer delays between the conditioned stimulus (CS) and unconditioned stimulus (US). Very brief CS-US intervals (10 seconds) were ineffective in establishing taste aversion, unlike longer intervals.

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Area of Science:

  • Behavioral neuroscience
  • Learning and memory

Background:

  • Taste aversion learning is unique, allowing acquisition despite long delays between conditioned stimulus (CS) and unconditioned stimulus (US).
  • The impact of very brief CS-US intervals on taste aversion learning is less understood.
  • This study investigates if close temporal contiguity is essential for conditioned taste aversion.

Purpose of the Study:

  • To compare the effectiveness of very brief (10 s) versus lengthier (15 and 30 min) CS-US intervals in conditioned taste aversion acquisition.
  • To determine if close temporal contiguity is necessary for this type of learning.

Main Methods:

  • A one-trial learning paradigm was employed.
  • Rats received a saccharin solution (CS) followed by apomorphine hydrochloride (US) at varying delays.

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  • Infusion pumps and indwelling catheters ensured precise CS and US delivery.

    • Main Results:

    • Significant taste aversions were acquired with 15-min and 30-min CS-US delays.
    • A 10-second CS-US interval did not result in significant aversion acquisition.
    • Close temporal contiguity was ineffective in establishing conditioned taste aversion.

    Conclusions:

    • Conditioned taste aversion acquisition is not dependent on close temporal contiguity between CS and US.
    • Extended CS-US intervals are effective, while very brief intervals are not sufficient for taste aversion learning.
    • This finding highlights the distinct temporal parameters of taste aversion learning compared to other learning paradigms.