Temporal facilitation in the integration of contours

Barraza, J.; Chambeaud, Javier G.

doi:10.1167/13.9.722

Cited by 1 publication

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The model suggests that the contour integration in the SBF occurs very early in visual processing (perhaps in V1 or V2), due to the concurrent action of spatial and temporal facilitation mechanisms and signals from motion estimation. Although a large amount of evidence shows the critical role of spatial facilitation in the integration of contours (Cass & Spehar, 2005; Field et al, 1993; Polat, 1999; Polat et al, 1998; Polat & Sagi, 1993; Solomon & Morgan, 2000), the role of the mechanisms of temporal facilitation is hardly argued (Cass & Alais, 2006; Barraza & Chambeaud, 2013; Chambeaud & Barraza 2013; Huang & Hess 2008). In the case of the SBF, such a mechanism may allow the system to accumulate information about the contour in time because instant information could be very poor.…”

Section: Discussionmentioning

confidence: 99%

Effect of disparity on the perception of motion-defined contours.

Chambeaud¹,

Martín²,

Barraza³

2014

Psychology & Neuroscience

View full text Add to dashboard Cite

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.

show abstract