A5010631957- Visual perception and processing mechanisms
- Color perception and design
- Face Recognition and Perception
- Design Education and Practice
- Neural dynamics and brain function
- Neurobiology and Insect Physiology Research
York University
2012-2016
The human visual system must extract reliable object information from cluttered scenes several times per second, and this temporal constraint has been taken as evidence that the underlying cortical processing be strictly feedforward. Here we use a novel rapid reinforcement paradigm to probe dynamics of neural circuit shape perception thus test feedforward assumption. Our results show two stimuli are optimally reinforcing when separated in time by ∼60 ms, suggesting an recurrent with constant...
We have recently reported that natural contours induce perceptual distortions in neighbouring regions of visual space (Goren & Elder VSS2013). However, the magnitude these has yet to be quantified, and precise conditions necessary generate them remain unclear. Here we employ a new quantitative method measure size distortions, systematically vary complexity inducing determine whether contour shape modulates their genesis. Methods. The stimulus consisted collinear triplet dots orthogonal...
Biases in the judgement of lengths plane abound; examples include Muller-Lyer illusion and vertical-horizontal illusion. Here we demonstrate a new form bias induced by shape. There are two reasons to predict such bias. First, some theories hold that shape is neurally represented as deformation process. Such mechanism might induce artifactual distortions perceived metric structure image. Second, if induces 3D percept, this 2D judgements. Methods. Observers presented with triplet points,...
The human visual system must extract reliable shape information from cluttered scenes several times per second, yet the nature of underlying computation remains poorly understood. Here we probe dynamics this process to estimate time constants that might provide clues neural circuit. We employed a repetitive-presentation discrimination paradigm. On each trial, one or two instances single-frame (10msec) stimulus presentation were embedded in continuous dynamic noise sequence consisting...