Abstract
Several kinds of light used in vision experiments produce photon statistics that are distinctly non-Poisson. Representative examples are light from a cathode-ray tube and an image-intensifier device. For the class of vision experiments in which the photon statistics play an important role, excess fluctuations produced by such light sources can alter the observed results and obscure the visual mechanisms being studied. They must therefore be accounted for in a proper way. We use the results of a Hecht-Shlaer-Pirenne type experiment, carried out with modulated Poisson light, to illustrate the point. Sensitivity and modulation depth, as well as sensitivity and reliability, are shown to be traded against each other. Finally, we demonstrate that number-state light, which is comprised of photons of an ideal kind, provides the ultimate tool for extracting information about the intrinsic noise distribution in the visual system at threshold. The state of the art in producing such light is discussed.
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This work was carried out at Columbia University and was supported by the National Science Foundation and the National Institutes of Health
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Teich, M.C., Prucnal, P.R., Vannucci, G. et al. Multiplication noise in the human visual system at threshold. Biol. Cybern. 44, 157–165 (1982). https://doi.org/10.1007/BF00344271
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DOI: https://doi.org/10.1007/BF00344271