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Brain evoked potentials as predictors of risk
1Department of Psychiatry, University of Colorado Health Sciences Center, Denver.
Recent Developments in Alcoholism : an Official Publication of the American Medical Society on Alcoholism, the Research Society on Alcoholism, and the National Council on Alcoholism
|January 1, 1988
Summary
Sensory evoked potentials, specifically the P300 wave, reveal genetic links to alcoholism. Lower P300 amplitudes in high-risk individuals suggest inherited differences in alcohol sensitivity and brain function.
Area of Science:
- Neuroscience
- Genetics
- Psychiatry
Background:
- Sensory evoked potentials measure brain sensory and cognitive function.
- These electrophysiological measures can reveal genetic influences on complex behaviors like alcoholism.
- Auditory evoked potentials have previously shown inherited differences in alcohol sensitivity.
Purpose of the Study:
- To investigate the utility of sensory evoked potentials, particularly the P300 wave, in demonstrating genetic influences on alcoholism risk.
- To examine P300 amplitude differences in individuals at high risk for alcoholism.
Main Methods:
- Utilizing specific experimental paradigms to elicit P300 waves.
- Measuring P300 amplitudes in subjects with a family history of alcoholism (high-risk) compared to controls.
- Administering small doses of alcohol to assess its effect on P300 amplitude in high-risk subjects.
Main Results:
- P300 wave amplitude was found to be smaller in subjects at high risk for alcoholism.
- High-risk subjects exhibited lower P300 amplitudes when given small alcohol doses.
- Reduced P300 amplitude was also observed in younger, high-risk subjects with no prior alcohol exposure.
Conclusions:
- P300 amplitude serves as a potential biomarker for inherited predisposition to alcoholism.
- These findings suggest specific neuronal mechanisms underlie inherited alcohol sensitivity, not a general neuronal property.
- Evoked potential data align with prior electroencephalographic findings of abnormalities in children of alcoholics.