SciELO - Scientific Electronic Library Online

 
vol.22 issue2The relationship between morphological awareness and contextual reading measured by the Cloze testThe relation among variables of mental health and cognition in widowed elders author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Psicologia: Reflexão e Crítica

Print version ISSN 0102-7972

Abstract

SANTOS, Natanael Antonio dos; MENDES, Liana Chaves  and  ALVES, Príscilla Anny de Araújo. Contrast sensitivity of deaf and hearing children for sine-wave gratings in mesopic conditions. Psicol. Reflex. Crit. [online]. 2009, vol.22, n.2, pp. 230-235. ISSN 0102-7972.  http://dx.doi.org/10.1590/S0102-79722009000200009.

The aim of this study was to compare the contrast sensitivity (CSF) of deaf children and hearing children to spatial frequency of 0.25 to 2.0 cpd (cycles per degree of visual angle) at mesopic luminance level (0.7 cd/m2), using the psychophysical forced-choice method. Twenty children (7-12 years old) participated in this research, ten with prelingual deafness and ten with normal hearing. All participants had normal or corrected visual acuity. The ANOVA showed significant difference between the two groups [F(1, 238) = 15.487; p < 0.001], but the post-hoc Tukey HSD test analysis did not reveal significant difference in frequency to frequency comparison between the two groups (p > 0.05). The results suggest alterations in CSF to sine-wave gratings stimuli of deaf children at mesopic luminance level.

Keywords : Visual perception; Contrast sensitivity; Spatial frequency; Deaf children; Psychophysical method.

        · abstract in Portuguese     · text in Portuguese     · pdf in Portuguese