Network model of top-down influences on local gain and contextual interactions in visual cortex.

ABSTRACT: The visual system uses continuity as a cue for grouping oriented line segments that define object boundaries in complex visual scenes. Many studies support the idea that long-range intrinsic horizontal connections in early visual cortex contribute to this grouping. Top-down influences in primary visual cortex (V1) play an important role in the processes of contour integration and perceptual saliency, with contour-related responses being task dependent. This suggests an interaction between recurrent inputs to V1 and intrinsic connections within V1 that enables V1 neurons to respond differently under different conditions. We created a network model that simulates parametrically the control of local gain by hypothetical top-down modification of local recurrence. These local gain changes, as a

SUBMITTER: Piech V 

PROVIDER: S-EPMC3808648 | biostudies-literature | 2013 Oct

REPOSITORIES: biostudies-literature