Speed preferences in MT neurons are found to be unaffected by changes in stimulus pattern, supporting the hypothesis that these neurons represent retinal image velocities.
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Simoncelli, E., Heeger, D. Representing retinal image speed in visual cortex. Nat Neurosci 4, 461–462 (2001). https://doi.org/10.1038/87408
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DOI: https://doi.org/10.1038/87408
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