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Enhanced methamphetamine-induced conditioned place preference in risk-taking rats
Katsumasa Takahashi1, Michimasa Toyoshima1, Yukio Ichitani1
1Institute of Psychology and Behavioral Neuroscience, University of Tsukuba, Tsukuba, Ibaraki, 305-8577, Japan.
Behavioural Brain Research
|October 22, 2019
Summary
Rats exhibiting higher risk-taking behaviors on a gambling task showed increased vulnerability to methamphetamine dependence. This suggests a link between decision-making and susceptibility to drug addiction.
Area of Science:
- Neuroscience
- Behavioral Science
- Psychiatry
Background:
- Psychiatric disorders often involve maladaptive decision-making, particularly in conditions like gambling and substance use.
- Individual differences in risk-taking behavior are a key factor in understanding vulnerability to addiction.
Purpose of the Study:
- To assess individual differences in risk-taking using a rat gambling task (GT).
- To investigate the relationship between risk-taking behaviors and vulnerability to methamphetamine dependence via conditioned place preference (CPP).
Main Methods:
- Rats were trained on a radial arm maze gambling task for 14 days, choosing between low-risk/low-reward, high-risk/high-reward, and empty arms.
- Methamphetamine-induced CPP involved habituation, conditioning, preference testing, extinction, extinction testing, and reinstatement testing.
Main Results:
- A significant positive correlation was found between choosing the high-risk/high-reward arm and time spent in the methamphetamine-paired compartment during the initial preference test.
- This correlation was not observed during extinction or reinstatement tests, indicating a specific link to initial drug seeking.
Conclusions:
- Risk-taking rats demonstrate heightened vulnerability to methamphetamine dependence.
- Decision-making processes, specifically risk preference, may predict susceptibility to drug addiction.