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The Variation of Visual Sensory Reflex Action with Intensity of Stimulation

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Abstract

SYNOPSIS

In this paper there is first a brief résumé of former investigations on the Porter Effect in regard to the retinal effects of varying the intensity of the light stimulus.

Seventeen new Porter graphs have been obtained with bright colors, and instead of only two branches that the Porter graphs were believed to have, from three to five were found.

The effect upon the retinal sensitiveness was measured for intensities corresponding to each branch of the graphs. It was found that this consisted of depression or enhancement of the sensitiveness of the retina.

The relation of these discoveries to the following visual phenomena is discussed: The Fechner Paradox, the Purkinje effect, the Receptor process in respect to the Hering, Edridge-Green, Ladd-Franklin and Young theories, the Weber-Fechner law, Equilibrium effects, Invariable colors, the Self light and Sensation process, the Duplicity theory, Reciprocal innervation, and the partial reconciliation of the Young and Hering color theories.

© 1926 Optical Society of America

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