Oct 31, 2018

The emergence of multiple retinal cell types through efficient coding of natural movies

BioRxiv : the Preprint Server for Biology
Samuel A. OckoStephane Deny


One of the most striking aspects of early visual processing in the retina is the immediate parcellation of visual information into multiple parallel pathways, formed by different retinal ganglion cell types each tiling the entire visual field. Existing theories of efficient coding have been unable to account for the functional advantages of such cell-type diversity in encoding natural scenes. Here we go beyond previous theories to analyze how a simple linear retinal encoding model with different convolutional cell types efficiently encodes naturalistic spatiotemporal movies given a fixed firing rate budget. We find that optimizing the receptive fields and cell densities of two cell types makes them match the properties of the two main cell types in the primate retina, midget and parasol cells, in terms of spatial and temporal sensitivity, cell spacing, and their relative ratio. Moreover, our theory gives a precise account of how the ratio of midget to parasol cells decreases with retinal eccentricity. Also, we train a nonlinear encoding model with a rectifying nonlinearity to efficiently encode naturalistic movies, and again find emergent receptive fields resembling those of midget and parasol cells that are now further subdivi...Continue Reading

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Mentioned in this Paper

Biochemical Pathway
Ganglion Cell
Entire Retina
Parasol Ganglion Cell of Retina
Spatial Distribution
Extracellular Matrix Organization
Cell Culture Techniques
Retinal Diseases
Theoretical Study

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