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Flicker techniques in the determination of visual latency

The relationship between reaction time and visual latency relative to a fixed stimulus has been measured in haploscopic vision by means of the flicker effect produced by two stimuli of different luminance levels. The fields of foveal vision were of 50', the retinal illuminance was from 8 to 100 td and three observers were used. The results show in all cases that the motor component in the nervous system is not constant, and that the evolution of this factor according to the luminance of the stimulus conforms to a function of the same kind as Pieron's law.