Universidad Complutense de Madrid
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Characterizing visual asymmetries in contrast perception using shaded stimuli.



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Chacón Gómez, José y Castellanos López, Miguel Ángel y Serrano Pedraza, Ignacio (2015) Characterizing visual asymmetries in contrast perception using shaded stimuli. Journal of vision, 15 (11). pp. 1-14. ISSN 1534-7362

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URL Oficial: http://dx.doi.org/doi:10.1167/15.16.11


Previous research has shown a visual asymmetry in shaded stimuli where the perceived contrast depended on the polarity of their dark and light areas (Chacón, 2004). In particular, circles filled out with a top-dark luminance ramp were perceived with higher contrast than top-light ones although both types of stimuli had the same physical contrast. Here, using shaded stimuli, we conducted four experiments in order to find out if the perceived contrast depends on: (a) the contrast level, (b) the type of shading (continuous vs. discrete) and its degree of perceived three-dimensionality, (c) the orientation of the shading, and (d) the sign of the perceived contrast alterations. In all experiments the observers' tasks were to equate the perceived contrast of two sets of elements (usually shaded with opposite luminance polarity), in order to determine the subjective equality point. Results showed that (a) there is a strong difference in perceived contrast between circles filled out with luminance ramp top-dark and top-light that is similar for different contrast levels; (b) we also found asymmetries in contrast perception with different shaded stimuli, and this asymmetry was not related with the perceived three-dimensionality but with the type of shading, being greater for continuous-shading stimuli;

Tipo de documento:Artículo
Palabras clave:Shaded stimuli, Perceived contrast, Contrast asymmetries, Shape from shading
Materias:Ciencias Biomédicas > Psicología > Psicología experimental
Ciencias Biomédicas > Psicología > Percepción
Ciencias Biomédicas > Óptica y optometría > Óptica oftálmica
Código ID:36264
Depositado:08 Abr 2016 11:48
Última Modificación:20 Abr 2016 14:35

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