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

      Nature neuroscience

      physiology, Visual Pathways, Visual Cortex, Neural Networks (Computer), Models, Neurological, Forecasting, Feedback

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          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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          Author and article information

          Journal
          10195184
          10.1038/4580

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