Abstract
Retinal induction was studied in the light-adapted human retina by the method of electrostimulation. 1. The properties of retinal induction are qualitatively the same as in the dark-adapted retina except that its dissipation is more rapid. 2. There is an optimal intensity of adapting light for production of retinal induction. 3. Color induction occurs when the intensity of inducing colored light is above the color-threshold. 4. Below the color-threshold a colored patch may appear dark against the background. Then a curve of induction is found quite different from the curve of color induction. A similar curve is obtained by a sequence of stimuli, black and white (brightness induction). 5. The critical intensity of inducing light changing from color induction to brightness induction is higher for blue and red lights and lower for yellow and green lights. 6. In the transitory range of intensity from color induction to bright-ness induction a curve of certain type belonging to neither of those stated above is obtained.
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