Abstract

DE ANDRADE, MICHAEL JACKSON OLIVEIRA; GADELHA, MARIA JOSÉ NUNES; SILVA, JANDILSON AVELINO  and  DOS SANTOS, NATANAEL ANTONIO. Visual processing of concentric sine-wave gratings in adolescents and adults. Av. Psicol. Latinoam. [online]. 2013, vol.31, n.1, pp.156-164. ISSN 1794-4724.

The aim of this study was to compare the contrast visual processing of concentric sinusoidal gratings stimuli between adolescents and adults. The study included 20 volunteers divided into two groups: 10 adolescents aged 13-19 years (M=16.5, SD=1.65) and 10 adults aged 20-26 years (M=21.8, SD=2.04). In order to measure the contrast sensitivity at spatial frequencies of 0.6, 2.5, 5 and 20 degrees of visual angle (cpd), it was used the psychophysical method of two alternative forced choice (2AFC). A One Way ANOVA performance showed a significant difference in the comparison between groups: F [(4, 237) = 3.74, p <.05]. The post-hoc Tukey HSD showed a significant difference between the frequencies of 0.6 (p <.05) and 20 cpd (p <.05). Thus, the results showed that the visual perception behaves differently with regard to the sensory mechanisms that render the contrast towards adolescents and adults. These results are useful to better characterize and comprehend human vision development.

Keywords : Contrast sensitivity; concentric sine-wave gratings; psychophysical forced choice method; adolescents.

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