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Published on: February 19, 2011
Learning and tolerance to the ataxic effect of ethanol
1McMaster University, Department of Psychology, Hamilton, Ontario, Canada.
Pharmacology, Biochemistry, and Behavior
|August 26, 1998
Summary
Novel stimuli disrupt drug tolerance by inhibiting associative learning. This study shows that external inhibition affects ethanol tolerance and compensatory responses, with disruption decreasing over time. Understanding these mechanisms is key for addiction research.
Area of Science:
- Neuroscience
- Behavioral Pharmacology
- Psychopharmacology
Background:
- Drug-associated cues play a critical role in the development and expression of drug tolerance.
- Pavlovian conditioning analysis suggests tolerance is subject to external inhibition by novel stimuli.
Purpose of the Study:
- To investigate the role of external inhibition in attenuating ethanol tolerance.
- To examine the effect of novel stimuli on compensatory conditioned responses (CR) in ethanol-tolerant rats.
Main Methods:
- Rats tolerant to the ataxic effects of ethanol were tested on a tilting plane.
- Novel strobe/noise stimuli were presented to assess disruption of tolerance and CR.
- The effect of stimulus omission and varying delays between training and testing was evaluated.
Main Results:
- A compensatory CR was observed in ethanol-tolerant rats.
- Both tolerance and the compensatory CR were disrupted by a novel strobe/noise stimulus.
- Disruption was also observed with the omission of a previously paired stimulus, and decreased with a 10-day delay between training and testing.
Conclusions:
- Novel stimuli attenuate ethanol tolerance through external inhibition of Pavlovian conditioning.
- The interval between training and testing is crucial for assessing associative tolerance.
- These findings provide converging evidence for the role of associative learning in drug tolerance.
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