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MDMA and memory: the acute and chronic effects of MDMA in pigeons performing under a delayed-matching-to-sample
1Department of Psychology, Western Michigan University, Kalamazoo 49008.
Abstract:
The purpose of the present study was to examine the acute and chronic effects of (+/-)3,4-methylenedioxy-methamphetamine (MDMA) in pigeons responding under a delayed-matching-to-sample procedure with 0-, 3-, and 6-s delays. In the absence of drug, accuracy (percent correct responses) was inversely related to delay length. When administered pre-chronically, MDMA (0.32-5.6 mg/kg) generally decreased accuracy and response rates at doses of 3.2 mg/kg and above. Although humans report a distinct "hangover" when exposure to MDMA ends, performance of pigeons in the present study did not deteriorate when the chronic regimen ended, indicating an absence of behavioral dependence on the drug. Tolerance developed following chronic exposure to 3.2 mg/kg. In general, greater tolerance occurred at the 0-s delay than at longer delays. Although MDMA is reported to have neurotoxic effects, it does not inevitably produce long-lasting or cumulative behavioral impairment.
Insights
This study investigated the effects of 3,4-methylenedioxy-methamphetamine (MDMA) on pigeon behavior. MDMA decreased accuracy and response rates, but pigeons did not show dependence, and tolerance developed without long-lasting impairment.
Area of Science:
- Behavioral pharmacology
- Neuroscience
- Animal models of drug effects
Background:
- 3,4-methylenedioxy-methamphetamine (MDMA) is a psychoactive drug with known effects in humans.
- Understanding MDMA's behavioral impact in controlled settings is crucial for its study.
- Pigeons are a well-established model for cognitive and behavioral research.
Purpose of the Study:
- To assess the acute and chronic effects of MDMA on pigeon performance.
- To investigate potential behavioral dependence and tolerance to MDMA.
- To examine MDMA's impact on accuracy and response rates under varying delay conditions.
Main Methods:
- Pigeons were trained on a delayed-matching-to-sample procedure with 0-, 3-, and 6-second delays.
- MDMA was administered acutely and chronically at doses ranging from 0.32 to 5.6 mg/kg.
- Behavioral measures included accuracy (percent correct) and response rates.
Main Results:
- MDMA decreased accuracy and response rates at doses of 3.2 mg/kg and higher.
- No evidence of behavioral dependence was observed after chronic MDMA exposure.
- Tolerance to MDMA's effects developed, particularly at the 0-second delay condition.
Conclusions:
- MDMA impairs cognitive performance in pigeons, but does not lead to behavioral dependence.
- Tolerance to MDMA develops with chronic administration.
- MDMA does not appear to cause cumulative or long-lasting behavioral deficits in this model.