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Origin and effect of phototransduction noise in primate cone photoreceptors

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Abstract

Noise in the responses of cone photoreceptors sets a fundamental limit on visual sensitivity, yet the origin of noise in mammalian cones and its relation to behavioral sensitivity are poorly understood. Our work here on primate cones improves understanding of these issues in three ways. First, we found that cone noise was not dominated by spontaneous photopigment activation or by quantal fluctuations in photon absorption, but was instead dominated by other sources, namely channel noise and fluctuations in cyclic GMP. Second, adaptation in cones, unlike that in rods, affected signal and noise differently. This difference helps to explain why thresholds for rod- and cone-mediated signals have different dependencies on background light level. Third, past estimates of noise in mammalian cones are too high to explain behavioral sensitivity. Our measurements indicate a lower level of cone noise and therefore help to reconcile physiological and behavioral estimates of cone noise and sensitivity.

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Figure 1: Temporal components of cone outer segment noise.
Figure 2: Two-electrode recordings allow pharmacological manipulation of cone phototransduction.
Figure 3: High-frequency noise arises from open and close transitions in the cGMP-gated channels.
Figure 4: An additional noise source with power in the low-to-mid frequency range causes fluctuations in cGMP.
Figure 5: Adaptation similarly affects rod signal and noise.
Figure 6: Adaptation affects cone signal and noise differently.
Figure 7: Background dependence of rod and cone detection thresholds.

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Acknowledgements

We thank C. Asbury, F. Dunn, G. Horwitz and R. Sinha for helpful comments on an earlier version of the paper, and M. Cafaro and P. Newman for excellent technical assistance. Color scales were developed and made freely available for Matlab by M. Niccoli. Support was provided by the Howard Hughes Medical Institute (F.R.) and the National Eye Institute of the US National Institutes of Health (R01EY11850 to F.R.). Retinas were obtained from the Washington National Primate Research Center at the University of Washington, US National Institutes of Health grant RR00166, and from the National Center for Research Resources and the Office of Research Infrastructure Programs of the National Institutes of Health through grant Number P51 OD 010425.

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J.M.A. and F.R. conducted experiments, performed analyses and wrote the manuscript.

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Correspondence to Fred Rieke.

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The authors declare no competing financial interests.

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Angueyra, J., Rieke, F. Origin and effect of phototransduction noise in primate cone photoreceptors. Nat Neurosci 16, 1692–1700 (2013). https://doi.org/10.1038/nn.3534

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