Decorrelation and efficient coding by retinal ganglion cells.
Decorrelation and efficient coding by retinal ganglion cells.
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DOI:
10.1038/nn.3064
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发表时间:
2012-03-11
影响因子:
25
通讯作者:
中科院分区:
文献类型:
--
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An influential theory of visual processing asserts that retinal center-surround receptive fields remove spatial correlations in the visual world, producing ganglion cell spike trains that are less redundant than the corresponding image pixels. For bright, high-contrast images, this decorrelation would enhance coding efficiency in optic nerve fibers of limited capacity. Here we test the central prediction of the theory and demonstrate that the spike trains of retinal ganglion cells are indeed decorrelated compared to the visual input. However, most of the decorrelation is accomplished not by the receptive fields, but by nonlinear processing in the retina. We show that a steep response threshold enhances efficient coding by noisy spike trains, and the effect of this nonlinearity is near optimal in both salamander and macaque retina. These results offer an explanation for the sparseness of retinal spike trains, and highlight the importance of treating the full nonlinear character of neural codes.
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