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Nat Neurosci. 1999 Jan;2(1):79-87.

Predictive coding in the visual cortex: a functional interpretation of some extra-classical receptive-field effects.

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  • 1Salk Institute, Sloan Center for Theoretical Neurobiology, La Jolla, California, USA. rao@salk.edu

Abstract

We describe a model of visual processing in which feedback connections from a higher- to a lower-order visual cortical area carry predictions of lower-level neural activities, whereas the feedforward connections carry the residual errors between the predictions and the actual lower-level activities. When exposed to natural images, a hierarchical network of model neurons implementing such a model developed simple-cell-like receptive fields. A subset of neurons responsible for carrying the residual errors showed endstopping and other extra-classical receptive-field effects. These results suggest that rather than being exclusively feedforward phenomena, nonclassical surround effects in the visual cortex may also result from cortico-cortical feedback as a consequence of the visual system using an efficient hierarchical strategy for encoding natural images.

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PMID:
10195184
[PubMed - indexed for MEDLINE]
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