Article abstract
Nature Neuroscience 10, 1483 - 1491 (2007)
Published online: 30 September 2007 | doi:10.1038/nn1967
Attention alters spatial integration in macaque V1 in an eccentricity-dependent manner
Mark Roberts1,2, Louise S Delicato1, Jose Herrero1, Mark A Gieselmann1 & Alexander Thiele1
Abstract
Attention can selectively enhance neuronal responses and exclude external noise, but the neuronal computations that underlie these effects remain unknown. At the neuronal level, noise exclusion might result in altered spatial integration properties. We tested this proposal by recording neuronal activity and length tuning in neurons of the primary visual cortex of the macaque when attention was directed toward or away from stimuli presented in each neuron's classical receptive field. For cells with central-parafoveal receptive fields, attention reduced spatial integration, as demonstrated by a reduction in preferred stimulus length and in the size of the spatial summation area. Conversely, in cells that represented more peripheral locations, attention increased spatial integration by increasing the cell's summation area. This previously unknown dichotomy between central and peripheral vision could support accurate analysis of attended foveal objects and target selection for impending eye movements to peripheral objects.
- Institute of Neuroscience, Henry Wellcome Building, Framlington Place, University of Newcastle upon Tyne, Newcastle upon Tyne, NE2 4HH, UK.
- Current address: F.C. Donders Centre for Cognitive Neuroimaging, P.O. Box 9101, 6500 HB Nijmegen, The Netherlands.
Correspondence to: Alexander Thiele1 e-mail: alex.thiele@ncl.ac.uk
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