Abstract
Human foveal vision is subserved initially by groups of spatial, temporal and orientational ‘filters’, the outputs of which are combined to define perceptual objects. Although a great deal is known about the filtering properties of individual cortical cells, relatively little is known about the nature of this ‘linking’ process. One recent approach1 has shown that the process can be thought of in terms of an association field whose strength is determined conjointly by the orientation and distance of the object. Here we describe a fundamental difference in this feature-linking process in central and peripheral parts of the visual field, which provides insight into the ways that foveal and peripheral visual perception differ2,3. In the fovea, performance can be explained only by intercellular linking operations whereas in the periphery intracellular filtering will suffice. This difference represents a substantial economy in cortical neuronal processing of peripheral visual information and may allow a recent theory of intercellular binding to be tested4,5,6,7.
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Acknowledgements
This work was supported by the Canadian MRC (MT 10818).
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Hess, R., Dakin, S. Absence of contour linking in peripheral vision. Nature 390, 602–604 (1997). https://doi.org/10.1038/37593
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DOI: https://doi.org/10.1038/37593
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