Whitening and independent component filters of simulated cone mosaic output have spatio-chromatic properties of pLGN and V1

Eizaburo Doi & Toshio Inui

Proceedings of 7th ICONIP, 2000, pp.500-505.

Abstract
We describe the properties of whitening and independent component filters of appropriately simulated input to the visual nervous system in the spatio-chromatic domain. This input simulates the output of a trichromatic cone mosaic to natural scenes, and in our model of the early visual system, this is firstly transformed by whitening filters and then transformed by independent component filters. As a result, the whitening filters have the spatio-chromatic properties of type I neurons in the parvocelluar layer of LGN (pLGN), and independent component filters have those similar to either simple or double-opponent type neurons in V1. It should also be noted that, at the level of the whitening process, both luminance and red-green information are conveyed by the same set of r-g type units, but at the following stage of the independent component analysis, these are separated by the distinct sets of either simple or double-opponent type units, consistent with the physiological or psychophysical observations of the early visual system. These findings suggest that the spatio-chromatic properties of the early visual system should be explained by a hierarchical redundancy reduction process of its input.


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