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Moderate acute alcohol intoxication has minimal effect on surround suppression measured with a motion direction discrimination task.

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Read, Jenny C A and Georgiou, Renos and Brash, Claire and Yazdani, Partow and Whittaker, Roger and Trevelyan, Andrew J and Serrano Pedraza, Ignacio (2015) Moderate acute alcohol intoxication has minimal effect on surround suppression measured with a motion direction discrimination task. Journal of vision, 15 (1). 15.1.5. ISSN 1534-7362

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Official URL: http://dx.doi.org/ 10.1167/15.1.5



Abstract

A well-studied paradox of motion perception is that, in order to correctly judge direction in high-contrast stimuli, subjects need to observe motion for longer in large stimuli than in small stimuli. This effect is one of several perceptual effects known generally as "surround suppression." It is usually attributed to center-surround antagonism between neurons in visual cortex, believed to be mediated by GABA-ergic inhibition. Accordingly, several studies have reported that this index of surround suppression is reduced in groups known to have reduced GABA-ergic inhibition, including older people and people with schizophrenia and major depressive disorder. In this study, we examined the effect on this index of moderate amounts of ethanol alcohol. Among its many effects on the nervous system, alcohol potentiates GABA-ergic transmission. We therefore hypothesized that it should further impair the perception of motion in large stimuli, resulting in a stronger surround-suppression index. This prediction was not borne out. Alcohol consumption slightly worsened duration thresholds for both large and small stimuli, but their ratio did not change significantly.


Item Type:Article
Uncontrolled Keywords:Ethanol, Motion perception, Vision, Psychophysics, Surround suppression
Subjects:Medical sciences > Psychology > Experimental psychology
Medical sciences > Psychology > Perception
Medical sciences > Optics > Visual perception
ID Code:36270
Deposited On:13 Apr 2016 10:02
Last Modified:20 Apr 2016 10:18

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