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- Title
Predictive coding in the visual cortex: a functional interpretation of some extra-classical receptive-field effects.
- Authors
Rao, R P; Ballard, D H
- 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.
- Publication
Nature neuroscience, 1999, Vol 2, Issue 1, p79
- ISSN
1097-6256
- Publication type
Journal Article
- DOI
10.1038/4580