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. Author manuscript; available in PMC: 2010 Jul 17.
Published in final edited form as: J Vis. 2007 Jun 18;7(8):6. doi: 10.1167/7.8.6

Figure 6.

Figure 6

Different receptive field structure for chromatic and achromatic stimuli. As a consequence of the mosaic arrangement, each receptive field has a spatiochromatic structure. The receptive field structure for chromatic stimuli may be different from that for achromatic stimuli. Left: Input weights as in previous figures. Middle: Smoothed receptive field (as in insets of previous figures) for achromatic stimuli. L and M cones contribute with like signs, as would be the case for pure luminance stimuli. Right: Smoothed receptive field for chromatic (L–M opponent) stimuli. L and M cones contribute with different signs, as would be the case for isoluminant chromatic stimuli. The unit is selective for oriented achromatic and chromatic stimuli, but the preferred orientation is different for achromatic than for chromatic edges.