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Two components of the human alcohol electro-oculogram
Janet E Wolf1, Geoffrey B Arden
1Department of Optometry and Visual Science, Applied Vision Research Centre, City University, London EC1 V 0HB, UK. j.e.wolf@city.ac.uk
Documenta Ophthalmologica. Advances in Ophthalmology
|May 11, 2005
Summary
Alcohol consumption alters the electrooculogram (EOG) through distinct positive and negative voltage changes. This study quantifies these alcohol-EOG responses, revealing different dose-response relationships for each component.
Area of Science:
- Ophthalmology
- Neuroscience
- Pharmacology
Background:
- The electrooculogram (EOG) reflects standing potential changes in the eye.
- Both light onset and alcohol ingestion elicit characteristic EOG responses.
- Previous work indicated separate pathways for alcohol and light in EOG generation, potentially affected differently in disease.
Purpose of the Study:
- To determine the distinct dose-response relationships for the positive peak and negative trough of the alcohol-induced EOG.
- To investigate the underlying mechanisms of alcohol's effect on EOG.
- To test the hypothesis of two distinct voltage changes governed by reversible reactions.
Main Methods:
- Fasting, dark-adapted subjects received oral doses of diluted alcohol.
- EOG recordings were taken to characterize positive peaks and negative troughs.
- Dose-response curves were analyzed for alcohol concentrations ranging from 3.54 to 450 mg Kg(-1).
Main Results:
- Semi-saturation for the positive EOG peak occurred at approximately 35 mg Kg(-1) alcohol.
- Semi-saturation for the negative EOG trough occurred at a lower level, 11 mg Kg(-1).
- These findings support the existence of two distinct voltage-changing processes in the alcohol-EOG.
Conclusions:
- The human EOG is not a single 'damped oscillation' but involves at least two distinct processes.
- The dose-response data align with a reversible reaction model for alcohol's interaction with ocular receptors.
- The effective blood alcohol concentrations observed are significantly lower than those causing intoxication.