Center-surround antagonism affects visual motion coherence

Aging Reduces Center-Surround Antagonism in Visual Motion Processing

Discriminating the direction of motion of a low-contrast pattern becomes easier with increasing stimulus area. However, increasing the size of a high-contrast pattern makes it more difficult for observers to discriminate motion. This surprising result, termed spatial suppression, is thought to be mediated by a form of center-surround suppression found throughout the visual pathway. Here, we exa...

Center-surround visual motion processing in migraine.

PURPOSE It has been proposed that reduced cortical inhibition might be a key feature of migraine. Here the authors compared migraine and control group performance for two visual motion tasks in which performance was considered to reflect center-surround inhibitory processes. These tasks use the observations that healthy young observers require longer stimulus durations to detect the direction o...

Function of center-surround antagonism for motion in visual area MT/V5: a modeling study

Neurons in cortical area MT or V5 of primates have a large, modulatory region surrounding the classical receptive field. This 'surround' has been suggested to be involved in motion segmentation, as well as in shape-from-motion processing. Our hypothesis is that it plays a functional role in both. We verify this by modeling the electrophysiological data obtained by Orban and co-workers in the ma...

Center–surround interactions in visual motion processing during binocular rivalry

When each eye is confronted with a dissimilar stimulus, the percept will generally alternate between the two. This phenomenon is known as binocular rivalry. Although binocular rivalry occurs at locations where targets overlap spatially, the area surrounding rivalrous targets can modulate their dominance. Here we show that during binocular rivalry of oppositely moving gratings, a surrounding gra...

CENTER-SURROUND INTERACTIONS IN VISUAL MOTION PROCESSING By Duje Tadin