Effects of moderate blood alcohol concentrations on spatial and temporal contrast sensitivity.

Pearson, Pauline M.; Timney, Brian

doi:10.15288/jsa.1998.59.163

Cited by 50 publications

(51 citation statements)

References 13 publications

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“…Given that when GABA receptors are acutely exposed to ethanol there is a potentiation of GABA-inhibiting currents (Davies, 2003), the very high concentration of GABA receptors expressed in the occipital cortex can explain the inhibiting effects of alcohol on the metabolism of the visual system (Hill and Toffolon, 1990;Nicholson et al, 1995;Pearson and Timney, 1998;Watten et al, 1998;Wilson and Mitchell, 1983). In addition, it has been recently reported that ethanol may exert an inhibitory action on the excitatory effect of glutamate on the N-methyl-D-Aspartate (NMDA) receptors (Weiner and Valenzuela, 2006).…”

Section: Discussionmentioning

confidence: 99%

Alcohol increases spontaneous BOLD signal fluctuations in the visual network

et al. 2010

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Section: Discussionmentioning

confidence: 99%

Alcohol increases spontaneous BOLD signal fluctuations in the visual network

et al. 2010

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“…Esses resultados são semelhantes a outros relatados na literatura, que encontraram declínio da sensibilidade ao contraste em freqüências mais altas, em homens e mulheres, após o consumo de álcool, sob condições de luminâncias baixas de 21 cd/m 2 (Pearson, 1997;Pearson & Timney, 1998b). Entretanto, os resultados do presente trabalho foram obtidos em condições metodológicas diferentes (luminância média de 0,7 cd/m 2 e sexo exclusivamente feminino).…”

Section: Discussionunclassified

Alterações na sensibilidade ao contraste relacionadas à ingestão de álcool

Cavalcanti

Santos

2008

Psic.: Teor. e Pesq.

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RESUMO -O objetivo deste trabalho foi caracterizar a função de sensibilidade ao contraste (FSC) para freqüências espaciais de 0,25, 1,0 e 4,0 cpg (ciclos por grau de ângulo visual) na ausência (Grupo Controle-GC) e após a ingestão moderada de álcool (Grupo Experimental-GE). Para tanto, foi utilizado o método psicofísico da escolha forçada. Participaram do estudo quatro mulheres, de 21 a 30 anos, com acuidade visual normal ou corrigida. Os resultados mostraram diferenças significativas entre os grupos na freqüência de 4,0 cpg (p = 0,039), sendo o GE mais sensível ao contraste do que o GC. Estes resultados sugerem alterações na FSC relacionadas à ingestão moderada de álcool.Palavras-chave: percepção visual; sensibilidade ao contraste; ingestão de álcool; freqüência espacial; método psicofísico. Changes in the Contrast SensitivityRelated to the Alcohol Ingestion ABSTRACT -The purpose of this paper was to characterize the contrast sensitivity function (CSF) for spatial frequencies equal to 0.25, 1.0 and 4.0 cpd (cycles per degree) in the absence (Control Group-CG) and after moderate alcohol ingestion (Experimental Group-EG). For such, the forced choice psychophysical method was used. The participants were four 21 to 30 year-old-women with normal or corrected visual acuity. The results showed a significant difference between groups at the spatial frequency of 4.0 cpd (p= 0.039), such that the EG was more sensitive to contrast than the CG. These results suggest alcohol-related alterations in the CSF.

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“…Mechanisms of distraction in terms of peripheral task engagement while driving can be postulated in terms of (1) the disruption of the visual field-eyes not on road (Zwahlen and DeBald, 1986;Wierwille, 1993); (2) the diversion of attention-looked but did not see (Strayer et al, 2003); or (3) the depletion of available processing resources-resource competition (Boer, 2001). In comparison, alcohol has been shown to have similar psychomotor impairment in terms of reduced normal visual search patterns (Green, 2003) or reduced contrast sensitivity and processing speed of sensory information (Jones et al, 1998;Pearson and Timney, 1998).…”

Section: Introductionmentioning

confidence: 99%