PROPAGATION OF RETINAL INDUCTION

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Abstract
The physiol. effect simultaneously induced around a retinal image can be measured by measuring the electrical excitability of the eye. This effect, however, disappears when a remote region of the retina is illuminated by another colored light complementary to the inducing light. It is likely that the two kinds of induction caused by the two lights at distant areas of the retina spread out through the retina and neutralize one another. Such an interaction cannot, however, be proved when one of the two lights falls on one side of the blind spot, the other on the other side. From this fact it follows that normal structure and function seem to be necessary for propagation of retinal induction. An after-image of white light has a blocking effect similar to that of the blind spot upon the propagation of retinal induction, and this phenomenon offers a serviceable means for the study of propagation. It was shown that some psychological phenomena known in gestalt-psychology could be ascribed to this phenomenon.
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