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• W2018370539 abstract "1. The influence of rods on cone-mediated vision was assessed in eight human observers. To this end, increment threshold functions were obtained by determining thresholds of a cone-detected test flash (25 ms duration, 655 nm wave-length, 13′ diameter) as a function of the illuminance of larger, 500 ms duration, rod-detected masking flashes. The type of photoreceptor influenced by each stimulus was carefully checked by means of a series of control procedures involving action spectra and selective rod adaptation. 2. When the rod mask was 512 nm in wave-length, 40′ in diameter, and less than one scotopic td in illuminance, increment threshold functions show that [Formula: see text], where ICth is cone test threshold, IR is rod mask illuminance, and D is a dark noise term similar to that used by Barlow (1956). Further increases in IR have no additional influences on cone test threshold until threshold is influenced by the combined action of the mask on both rods and cones. If IR is expressed in terms of scotopic flux rather than illuminance, the functional relationship obtained with all rod masks ≤ 40′ diameter and ≤ 580 nm wave-length is identical. 3. Over the range of illuminance where a square-root relationship is obtained, probability of seeing functions show that a signal-to-noise mechanism limits the detectability of the cone test flash. These findings suggests a quantitative model in which cones produce a signal in a detector which is proportional to the illuminance of the cone test flash. Within a neural locus designated E (excitatory spatial summator), a response is produced which over at least a 40′ diameter area, is proportional to the scotopic flux of the rod mask. E, however, feeds into a gain box, S, which saturates at illuminance levels at least 3 log10 units less than usual estimates of rod saturation. Other than saturation, S behaves in a linear fashion. 4. As diameter increases beyond 60′, rod masks of equal scotopic illuminance have progressively less influence on cone test threshold; rod masks > 2° have negligible influence on cone test threshold. We propose that I (inhibitory spatial summator), a neural locus which responds to scotopic flux provided over a very large area, attenuates the activity of E. The combined action of E and I is designated a rod channel. The response of cones and the rod channel summate at a detector. Within the detector, cone signals are distinguished from rod-related activity and intrinsic dark noise on the basis of signal-to-noise discriminations. 5. The neural substrate for this rod channel most probably involves the combined action of several neurones which synapse within the inner plexiform layer of the retina. The relationship of this rod channel to other perceptual phenomena is discussed." @default.
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• W2018370539 date "1983-04-01" @default.
• W2018370539 modified "2023-09-26" @default.
• W2018370539 title "The signal-to-noise characteristics of rod-cone interaction" @default.
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• W2018370539 doi "https://doi.org/10.1113/jphysiol.1983.sp014614" @default.
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