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The signal‐to‐noise characteristics of rod—cone interaction

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.