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Proc Natl Acad Sci U S A. 2011 May 3;108(18):7583-8. doi: 10.1073/pnas.1014655108. Epub 2011 Apr 18.

Mechanisms of perceptual organization provide auto-zoom and auto-localization for attention to objects.

Author information

  • 1Krieger Mind/Brain Institute and Department of Neuroscience, The Johns Hopkins University, Baltimore, MD 21218, USA.

Abstract

Visual attention is often understood as a modulatory field acting at early stages of processing, but the mechanisms that direct and fit the field to the attended object are not known. We show that a purely spatial attention field propagating downward in the neuronal network responsible for perceptual organization will be reshaped, repositioned, and sharpened to match the object's shape and scale. Key features of the model are grouping neurons integrating local features into coherent tentative objects, excitatory feedback to the same local feature neurons that caused grouping neuron activation, and inhibition between incompatible interpretations both at the local feature level and at the object representation level.

PMID:
21502489
[PubMed - indexed for MEDLINE]
PMCID:
PMC3088583
Free PMC Article
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