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• W2114098247 startingPage "10536" @default.
• W2114098247 abstract "Areas beyond the classical receptive field (CRF) can modulate responses of the majority of cells in the primary visual cortex of the cat (). Although general characteristics of this phenomenon have been reported previously, little is known about the detailed spatial organization of the surrounds. Previous work suggests that the surrounds may be uniform regions that encircle the CRF or may be limited to the ends of the CRF. We have examined the spatial organization of surrounds of single-cell receptive fields in the primary visual cortex of anesthetized, paralyzed cats. The CRF was stimulated with an optimal drifting grating, whereas the surround was probed with a second small grating patch placed at discrete locations around the CRF. For most cells that exhibit suppression, the surrounds are spatially asymmetric, such that the suppression originates from a localized region. We find a variety of suppressive zone locations, but there is a slight bias for suppression to occur at the end zones of the CRF. The spatial pattern of suppression is independent of the parameters of the suppressive stimulus used, although the effect is clearest with iso-oriented surround stimuli. A subset of cells exhibit axially symmetric or uniform surround fields. These results demonstrate that the surrounds are more specific than previously realized, and this specialization has implications for the processing of visual information in the primary visual cortex. One possibility is that these localized surrounds may provide a substrate for figure-ground segmentation of visual scenes." @default.
• W2114098247 created "2016-06-24" @default.
• W2114098247 creator A5023625979 @default.
• W2114098247 creator A5076114801 @default.
• W2114098247 creator A5078059795 @default.
• W2114098247 date "1999-12-01" @default.
• W2114098247 modified "2023-09-25" @default.
• W2114098247 title "Asymmetric Suppression Outside the Classical Receptive Field of the Visual Cortex" @default.
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• W2114098247 doi "https://doi.org/10.1523/jneurosci.19-23-10536.1999" @default.
• W2114098247 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6782433" @default.
• W2114098247 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/10575050" @default.
• W2114098247 hasPublicationYear "1999" @default.
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