Visual Cortical Mechanisms of Perceptual Grouping: Interacting Layers, Networks, Columns, and Maps


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Show simple item record Ross, William en_US Grossberg, Stephen en_US Mingolla, Ennio en_US 2011-11-14T19:07:55Z 2011-11-14T19:07:55Z 1998-06 en_US
dc.description.abstract The visual cortex has a laminar organintion whose circuits form functional columns in cortical maps. How this laminar architecture supports visual percepts is not well understood. A neural model proposes how the laminar circuits of Vl and V2 generate perceptual groupings that maintain sensitivity to the contrasts and spatial organization of scenic cues.The model can decisively choose which groupings cohere and survive, even while balanced excitatory and inhibitory interactions preserve contrast-sensitive measures of local boundary likelihood or strength. In the model, excitatory inputs from LGN activate layers 4 and 6 of Vl. Layer 6 activates an on-center off-surround network of inputs to layer 4. Together these layer 4 inputs preserve analog sensitivity to LGN input contrast. Layer 4 cells excite pyramidal cells in layer 2/3 which activate monosynaptic long-range horizontal excitory connections between layer 2/3 pyramidal cells, and short-range disynaptic inhibitory connections mediated by smooth stellate cells. These interactions support inward perceptual grouping between two or more boundary inducetd, but not outward grouping from a single inducer. These lJO\UHlary signals feed back to layer 4 via the layer 6-to-4 on-center off-surround network. This folded feecdback joind cells in different layers into functional columnns while selecting winning groupings. Layer G in V1 also sends top-dlown signals to LGN using an on-center off-surround network, which suppresses LGN cells that do not receive feedback, while selecting, enhaneing, and synchronizing activity of those that do. The model is used to simulate psychophysical and neurophysiological data about perceptual grouping, including various Gestalt grouping laws. en_US
dc.description.sponsorship Air Force Office of Scientific Research (D0-0175), British Petroleum (BP 89A-1204); Defense Advanced Research Projects Agency and Office of Naval Research (N00014-92-J-4015); HNC Software (SC9-4-001), National Science Foundation (IRI-90-00530); Office of Naval Research (N00014-1-91-4100, N00014-95-1-0409, 0NR N00014-9510657) en_US
dc.language.iso en_US en_US
dc.publisher Boston University Center for Adaptive Systems and Department of Cognitive and Neural Systems en_US
dc.relation.ispartofseries BUCAS/CNS Technical Reports; BUCAS/CNS-TR-1998-023 en_US
dc.rights Copyright 1998 Boston University. Permission to copy without fee all or part of this material is granted provided that: 1. The copies are not made or distributed for direct commercial advantage; 2. the report title, author, document number, and release date appear, and notice is given that copying is by permission of BOSTON UNIVERSITY TRUSTEES. To copy otherwise, or to republish, requires a fee and / or special permission. en_US
dc.subject Visual cortex en_US
dc.subject Perceptual grouping en_US
dc.subject Cortical layers en_US
dc.subject Cortical columns en_US
dc.subject Cortical maps en_US
dc.subject Cortical feedback en_US
dc.subject Illusory contours en_US
dc.subject V1 en_US
dc.subject V2 en_US
dc.subject LGN en_US
dc.title Visual Cortical Mechanisms of Perceptual Grouping: Interacting Layers, Networks, Columns, and Maps en_US
dc.type Technical Report en_US
dc.rights.holder Boston University Trustees en_US

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