February 1963
Volume 2, Issue 1
Articles  |   February 1963
Simultaneous Brightness Contrast For Flashes of Light of Different Durations
Author Affiliations
    Departments of Ophthalmology and Physiology, University of Michigan Ann Arbor, Mich.
Investigative Ophthalmology & Visual Science February 1963, Vol.2, 47-54. doi:https://doi.org/
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      MATHEW ALPERN; Simultaneous Brightness Contrast For Flashes of Light of Different Durations. Invest. Ophthalmol. Vis. Sci. 1963;2(1):47-54. doi: https://doi.org/.

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      © ARVO (1962-2015); The Authors (2016-present)

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Measurements have been made of the magnitude of simultaneous brightness contrast on two young adult male observers by a binocular brightness matching method. Five different luminances of the inducing pattern were studied and the duration of the exposure ivas varied, between 5 and 150 msec, along an arithmetic scale. For low inducing flash luminances, the longer exposures show the greater contrast effect. However, as the luminance of the inducing pattern was progressively increased, the duration of exposure shoioing the largest contrast effect systematically decreased. The curves resemble the Broca-Sulzer curves both in the manner, at any given luminance, that the ordinate varies with duration and in the way any given curve changes as luminance is varied. The data explain a previous contradiction between results from psychophysical and electrophysiological experiments and therefore greatly strengthen physiological theories of contrast.


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