Self-organization of spatio-chromatic receptive fields in the early visual system by ICA.

Eizaburo Doi & Toshio Inui

Technical report of IEICE, 1999, NC98-170, pp.131-138.

Abstract
In the natural visual environment, form and color seem to be statisically independent. It is therefore possible that the separation of form and color in the visual system is based on their statistical independence. In this study we generated a set of learning samples that is the response of cones in the cone-mosaic arrangement to the natural visual environment. We then calculated the filters(receptive fields) that transform the samples to a statistically independent representation using Independent Component Analysis(ICA). In the resulting filters, there are color-opponent receptive fields with high spectral sensitivities, as well as Gabor-like receptive fields consisting of both L- and M-cones. In the former, some filters also have spatial opponency, and some don't.
key words: ICA, natural image, cone-mosaic, V1, spatio-chromatic property, self-organization


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