Cells showing linear spatial summation are termed X cells ( also called parvocellular, P, or midget ganglion cells ), and those showing non-linear summation are Y cells ( also called magnocellular, M, or parasol retinal ganglion cells ), although the correspondence between X and Y cells ( in the cat retina ) and P and M cells ( in the primate retina ) is not as simple as it once seemed.
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