Abstract：
: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.
journal_name
Vision Resjournal_title
Vision researchauthors
De Meyer K,Spratling MWdoi
10.1016/j.visres.2008.12.017subject
Has Abstractpub_date
2009-03-01 00:00:00pages
553-68issue
5eissn
0042-6989issn
1878-5646pii
S0042-6989(08)00613-5journal_volume
49pub_type
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