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Genetic differences in psychomotor performance decrement after alcohol: a multivariate analysis
1Department of Psychiatry, Washington University School of Medicine, St. Louis, Missouri 63110.
Journal of Studies on Alcohol
|May 1, 1992
Summary
This study on alcohol's effects reveals two distinct responses to ethanol. One involves subjective feelings and balance, while the other impacts motor skills, with both having independent genetic and environmental influences.
Area of Science:
- Psychopharmacology
- Behavioral Genetics
- Neuroscience
Background:
- Ethanol (alcohol) consumption significantly impairs psychomotor performance.
- Individual differences in response to alcohol are well-documented but not fully understood.
- Twin studies offer a powerful approach to disentangle genetic and environmental influences on complex traits.
Purpose of the Study:
- To reanalyze data from a twin study examining psychomotor performance after a standard ethanol dose.
- To identify distinct factors contributing to alcohol-induced performance decline.
- To investigate the genetic and environmental underpinnings of these distinct factors.
Main Methods:
- Reanalysis of existing data from 206 same-sex twin pairs exposed to a standard ethanol dose (0.75 g/kg).
- Principal components analysis (PCA) to identify underlying factors of performance decline.
- Multivariate genetic analysis to assess the heritability and environmental influences on identified factors.
Main Results:
- PCA identified two orthogonal factors influencing alcohol's effects.
- Factor 1 correlated with body sway, self-rated intoxication, and low alcohol consumption, weakly with blood alcohol concentration (BAC).
- Factor 2 correlated with psychomotor coordination and BAC, independent of subjective intoxication or driving willingness.
- Multivariate genetic analysis suggested independent genetic and environmental determination for both factors.
Conclusions:
- Alcohol's impact on performance is not monolithic, comprising at least two distinct components.
- Subjective and objective measures of alcohol impairment may be influenced by different biological pathways.
- Genetic and environmental factors differentially contribute to sensitivity to alcohol's effects on psychomotor performance and subjective intoxication.