S-cone photoreceptors in the primate retina are functionally distinct from L and M cones.

Daylight vision starts with signals in three classes of cone photoreceptors sensitive to short (S), middle (M), and long (L) wavelengths. Psychophysical studies show that perceptual sensitivity to rapidly varying inputs differs for signals originating in S cones versus L and M cones; notably, S-cone signals appear perceptually delayed relative to L- and M-cone signals. These differences could originate in the cones themselves or in the post-cone circuitry. To determine if the cones could contribute to these and related perceptual phenomena, we compared the light responses of primate S, M, and L cones. We found that S cones generate slower light responses than L and M cones, show much smaller changes in response kinetics as background-light levels increase, and are noisier than L and M cones. It will be important to incorporate these differences into descriptions of how cone signaling shapes human visual perception.

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© 2019, Baudin et al.

Déclaration de conflit d'intérêts

JB JB is now employed by Google Inc. All work by JB on this manuscript was completed prior to joining Google Inc. JA, RS No competing interests declared, FR Reviewing editor, eLife