Journal
VISION RESEARCH
Volume 49, Issue 5, Pages 553-568Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.visres.2008.12.017
Keywords
Contrast detection; Contour integration; Lateral interactions; Attention; Perceptual grouping; Cortex; Neural network; Dendrites
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Past physiological and psychophysical experiments have shown that attention can modulate the effects of contextual information appearing outside the classical receptive field of a cortical neuron. Specifically, it has been suggested that attention, operating via cortical feedback connections, gates the effects of long-range horizontal connections underlying collinear facilitation in cortical area V1. This article proposes a novel mechanism, based on the computations performed within the dendrites of cortical pyramidal cells, that can account for these observations. Furthermore, it is shown that the top-down gating signal into V1 can result from a process of biased competition occurring in extrastriate cortex. A model based on these two assumptions is used to replicate the results of physiological and psychophysical experiments on collinear facilitation and attentional modulation. (C) 2009 Elsevier Ltd. All rights reserved.
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