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 macaque, and by developing a novel stimulus paradigm. Our results indicate an almost perfect dichotomy between both functionalities: our model neurons code for the object's edge if present, and for the first-order shape otherwise. We further show that small populations of model neurons can code linearly for the orientation-in-depth of translating planes.
Gautama
T
T
Laboratorium voor Neuro- en Psychofysiologie, K.U. Leuven, Campus Gasthuisberg, Herestraat 49, B-3000 Leuven, Belgium. temu@neuro.kuleuven.ac.be
Van Hulle
M M
MM
D000465:Algorithms; D000818:Animals; D004594:Electrophysiology; D005556:Form Perception / Q000502:physiology*; D008252:Macaca fascicularis; D008959:Models, Neurological; D009039:Motion Perception / Q000502:physiology*; D016011:Normal Distribution; D014793:Visual Cortex / Q000502:physiology*