Related Experiment Videos
Individual differences in responses to ethanol and d-amphetamine: a within-subject study.
1Department of Psychiatry, The University of Chicago, Chicago, Illinois 60637, USA.
Alcoholism, Clinical and Experimental Research
|May 1, 2001
Summary
Ethanol (EtOH) and d-amphetamine (AMP) can produce similar stimulant-like effects in some individuals. This study suggests these shared effects may stem from common neurochemical mechanisms, particularly in those who experience stimulant-like responses to alcohol.
Area of Science:
- Neuropharmacology
- Psychopharmacology
- Individual Differences in Drug Response
Background:
- Ethanol (EtOH) can induce stimulant-like subjective effects in some individuals, similar to d-amphetamine (AMP).
- Understanding the neurochemical basis for these individual differences in EtOH response is crucial.
- Examining responses to both EtOH and AMP in the same subjects can elucidate shared mechanisms.
Purpose of the Study:
- To investigate the neurochemical basis of individual differences in subjective responses to ethanol.
- To determine if ethanol and d-amphetamine share common mechanisms for producing stimulant-like subjective effects.
- To correlate subjective and objective responses to ethanol and d-amphetamine.
Main Methods:
- Twenty-seven healthy volunteers (aged 21-35) participated in a double-blind, placebo-controlled study.
- Participants received ethanol (0.8 g/kg), d-amphetamine (10 or 20 mg), or placebo across four sessions.
- Subjective and objective measures of drug effects, including stimulant-like effects, were assessed.
Main Results:
- Both ethanol and d-amphetamine produced expected subjective and behavioral effects.
- Significant inter-subject variability in ethanol's subjective effects was observed, with some reporting stimulant-like and others sedative-like responses.
- A positive correlation was found between subjective stimulant-like responses to ethanol and d-amphetamine (ARCI A scale), particularly in subjects reporting stimulant-like effects from ethanol.
Conclusions:
- Individuals experiencing pronounced stimulant-like effects from ethanol also report greater stimulant effects from d-amphetamine.
- This suggests that stimulant-like subjective effects of ethanol and d-amphetamine may be mediated by shared neurochemical pathways.
- Other measured effects, like vigilance or heart rate changes, did not show similar correlations, indicating potentially distinct mechanisms for those responses.