Contrast sensitivity function of sine-wave gratings in children with acute malnutrition
Psychol. neurosci. (Impr.)
;
2(1): 11-15, June 2009. ilus, graf, tab
Artigo
em Inglês
| LILACS
| ID: lil-567683
ABSTRACT
The aim of this study was to determine the contrast sensitivity curves of sine-wave gratings with spatial frequencies of 0.25, 1.0, 2.0 and 8.0 cycles per degree (cpd) of visual angle in 16 female subjects aged 7 to 9 years old, eight well-nourished and eight with acute protein-energy malnutrition (PEM). All participants had normal visual acuity and were free of identifiable ocular illness. Contrast threshold was measured using a temporal two-alternative forced-choice psychophysical method, at a distance of 150 cm of the stimuli, binocularly, with mean luminance of 40.1 cd/m2. We detected a general decline in contrast sensitivity for children with acute malnutrition at all spatial frequencies compared to well-nourished children. The malnourished group needed in average 1.37 times more contrast to detect the stimulus in comparison with the well-nourished one. Differences between the groups were statistically significant at all spatial frequencies (p < .001). These results suggest that acute PEM changes the visual perception for sine-wave gratings.
Texto completo:
DisponíveL
Índice:
LILACS (Américas)
Assunto principal:
Percepção Visual
/
Transtornos da Nutrição Infantil
/
Sensibilidades de Contraste
/
Criança
Tipo de estudo:
Estudo diagnóstico
Limite:
Feminino
/
Humanos
Idioma:
Inglês
Revista:
Psychol. neurosci. (Impr.)
Assunto da revista:
Neurologia
/
Psicologia
Ano de publicação:
2009
Tipo de documento:
Artigo
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