Effect of disparity on the perception of motion-defined contours
Psychol. neurosci. (Impr.)
; 7(2): 91-101, Jan.-June 2014. ilus, graf
Artigo
em Inglês
| Index Psicologia - Periódicos
| ID: psi-62658
Biblioteca responsável:
BR1.1
ABSTRACT
We present three experiments that explored the effect of binocular disparity on the perception of contours defined by motion in a Spatiotemporal Boundary Formation. Depending on the disparity, the stimulus is perceived as an object that moves behind a holed surface (occluded configuration) or as a luminous transparency that moves over a surface that contains dots (occluding configuration). In all of the experiments, we used a Vernier task to assess the strength of contour perception. In the first experiment, we measured acuity as a function of disparity for a range of speeds and dot densities. The results showed that, despite the difference in the percepts, acuity was similar in both situations, replicating the dependence on speed and dot density demonstrated in previous studies. In the second experiment, the results showed that the dynamics of contour integration were identical for both occluded and occluding configurations. In the third experiment, we tested whether the mechanism of contour integration works independently from the interpretation of the scene. In this experiment, we inverted the disparity during stimulus presentation so that the stimulus switched between occluded and occluding configurations. The results showed that the switch of the depth order increased the threshold to the value obtained with a shorter presentation time. This might be produced by a resetting of the integration process driven by the change of depth order. The results are discussed within a conceptual model that places the process of contour integration in the context of the perception of objects in a Spatiotemporal Boundary Formation.(AU)
Texto completo:
Disponível
Coleções:
Bases de dados nacionais
/
Brasil
Contexto em Saúde:
Agenda de Saúde Sustentável para as Américas
Problema de saúde:
Objetivo 11 Desigualdades e iniquidades na saúde
Base de dados:
Index Psicologia - Periódicos
Assunto principal:
Disparidade Visual
/
Percepção de Forma
Aspecto:
Equidade e iniquidade
Limite:
Adulto
/
Humanos
Idioma:
Inglês
Revista:
Psychol. neurosci. (Impr.)
Ano de publicação:
2014
Tipo de documento:
Artigo
/
Documento de projeto
Instituição/País de afiliação:
Universidad Nacional de Tucumán/Argentina