In both fruitflies and vertebrates, signals from photoreceptor cells are immediately split into two opposing channels in the downstream neurons. This might facilitate the computation of visual motion. See Letter p.300
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Lee, CH. The split view of motion. Nature 468, 178–179 (2010). https://doi.org/10.1038/468178a
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DOI: https://doi.org/10.1038/468178a
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