Two issues make this conclusion uncertain: (1) The probability of detection was very low, and only marginally statistically significant, (2) the paper does not provide a model that accounts for performance in both the single-photon detection task and the classical psychophysics task, which spans flash strengths in which detection performance ranges from chance to the near-perfect level.
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Primate retina trades single-photon detection for high-fidelity contrast encoding.
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