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dc.contributor.authorRoss, Williamen_US
dc.contributor.authorGrossberg, Stephenen_US
dc.contributor.authorMingolla, Ennioen_US
dc.date.accessioned2011-11-14T19:07:55Z
dc.date.available2011-11-14T19:07:55Z
dc.date.issued1998-06en_US
dc.identifier.urihttp://hdl.handle.net/2144/2357
dc.description.abstractThe 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.sponsorshipAir 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.isoen_USen_US
dc.publisherBoston University Center for Adaptive Systems and Department of Cognitive and Neural Systemsen_US
dc.relation.ispartofseriesBUCAS/CNS Technical Reports; BUCAS/CNS-TR-1998-023en_US
dc.rightsCopyright 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.subjectVisual cortexen_US
dc.subjectPerceptual groupingen_US
dc.subjectCortical layersen_US
dc.subjectCortical columnsen_US
dc.subjectCortical mapsen_US
dc.subjectCortical feedbacken_US
dc.subjectIllusory contoursen_US
dc.subjectV1en_US
dc.subjectV2en_US
dc.subjectLGNen_US
dc.titleVisual Cortical Mechanisms of Perceptual Grouping: Interacting Layers, Networks, Columns, and Mapsen_US
dc.typeTechnical Reporten_US
dc.rights.holderBoston University Trusteesen_US


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