The effect of alcohol ingestion on ocular counterrolling

Article type: Research Article

Authors: Markham, Charles H. | Diamond, Shirley G.^{; *}

Affiliations: Department of Psychology, University of California Santa Barbara, Santa Barbara, CA 93106, USA

Correspondence: [*] Corresponding author. Tel.: +1 805 893 3840; Fax: +1 805 893 8725; E-mail: diamond@psych.ucsb.edu

Abstract: Nineteen normal subjects underwent two naso-occipital rotations to 90° right and left ear down in our standard ocular counterrolling (OCR) protocol. Both eyes were videotaped. Following two rotations, subjects drank 90~ml vodka in 180 ml orange juice; and in about 20 min, when blood alcohol levels reached 0.04–0.09%, the protocol was repeated. An SMI videooculography system provided measurements. Results showed that amplitude of OCR was significantly decreased after alcohol ingestion; smoothness was significantly increased after alcohol, similar to alcohol's effect on essential tremor. Although disconjugacy was not significantly different in the two conditions when the entire trials were examined, the latter portions of the post-alcohol trials did show significant disconjugacy, similar to earlier findings in vestibular-defective patients whose OCR deficits were apparent only in the final segments of the rotation trials. We postulate the results are due to alcohol's action on cerebellar GABAergic Purkinje cells projecting to vestibular nuclei.

Keywords: Ocular counterrolling, alcohol, otolith, vestibular

DOI: 10.3233/VES-2006-164-505

Journal: Journal of Vestibular Research, vol. 16, no. 4-5, pp. 193-199, 2006