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Investigative Ophthalmology & Visual Science, Vol 36, 1548-1554, Copyright © 1995 by Association for Research in Vision and Ophthalmology

ARTICLES AND REPORTS

Ingested ethanol and binocular rivalry

M Donnelly and RJ Miller
Department of Psychology, Washington State University, Pullman 99164- 4820, USA.

PURPOSE. An early study claimed that ethanol ingestion can attenuate binocular rivalry and, in some cases, may produce the phenomenal fusion of normally rivalrous stimuli. The current study examined those claims in an experiment incorporating key controls that were lacking in the earlier study. METHODS. There were two conditions, one in which observers consumed ethanol and the other in which they consumed a placebo. Observers reported the course of binocular rivalry for several hours after drink consumption using two types of rivalry stimuli, one consisting of a continuously illuminated set of stimuli, the other consisting of dichoptic afterimages. RESULTS. Ingestion of ethanol resulted in a decrease in rivalry alternation rates, although there was no evidence of phenomenal fusion. Results were essentially identical for both stimulus types. CONCLUSION. It is suggested that this effect is not caused by ethanol-induced changes in oculomotor mechanisms but may be caused by ethanol-induced decreases in contrast sensitivity.




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Copyright © 1995 by the Association for Research in Vision and Ophthalmology