Visual Brain and Visual Perception: How Does the Cortex Do Perceptual Grouping?
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How the brain generates visual percepts is a central problem in neuroscience. We propose a detailed neural model of how LGN and the interblob cortical stream through V1 and V2 generate context-sensitive perceptual groupings from visual inputs. The model suggests a functional role for cortical layers, columns, maps, and networks and proposes homologous circuits for V1 and V2 with larger scale processing in V2. An integrated treatment of interlaminar, horizontal, orientational, and endstopping cortical interactions and a role for corticogeniculate feedback in grouping are proposed. Modeled circuits simulate parametric psychophysical data about boundary grouping and illusory contour formation.