Data/hora: 17/06/2024 04:47:04

Provedor de dados: 	Brazilian Journal of Medical and Biological Research	
País: 	Brazil	
Título: 	Acute effect of alcohol intake on sine-wave Cartesian and polar contrast sensitivity functions	
Autores: 	Cavalcanti-Galdino,M.K.; da Silva,J.A.; Mendes,L.C.; dos Santos,N.A.; Simas,M.L.B.	
Data: 	2014-04-01	
Ano: 	2014	
Palavras-chave: 	Visual perception; Contrast sensitivity function; Alcohol intake; Angular frequency; Psychophysical method.	
Resumo: 	The aim of this study was to assess contrast sensitivity for angular frequency stimuli as well as for sine-wave gratings in adults under the effect of acute ingestion of alcohol. We measured the contrast sensitivity function (CSF) for gratings of 0.25, 1.25, 2.5, 4, 10, and 20 cycles per degree of visual angle (cpd) as well as for angular frequency stimuli of 1, 2, 4, 24, 48, and 96 cycles/360°. Twenty adults free of ocular diseases, with normal or corrected-to-normal visual acuity, and no history of alcoholism were enrolled in two experimental groups: 1) no alcohol intake (control group) and 2) alcohol ingestion (experimental group). The average concentration of alcohol in the experimental group was set to about 0.08%. We used a paradigm involving a forced-choice method. Maximum sensitivity to contrast for sine-wave gratings in the two groups occurred at 4 cpd sine-wave gratings and at 24 and 48 cycles/360° for angular frequency stimuli. Significant changes in contrast sensitivity were observed after alcohol intake compared with the control condition at spatial frequency of 4 cpd and 1, 24, and 48 cycles/360° for angular frequency stimuli. Alcohol intake seems to affect the processing of sine-wave gratings at maximum sensitivity and at the low and high frequency ends for angular frequency stimuli, both under photopic luminance conditions.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2014000400321	
Editor: 	Associação Brasileira de Divulgação Científica	
Relação: 	10.1590/1414-431X20143209	
Formato: 	text/html	
Fonte: 	Brazilian Journal of Medical and Biological Research  v.47 n.4 2014	
Fonte: 	info:eu-repo/semantics/openAccess