Abstract
The neutralization of retinal induction was quantitatively investigated.
1. The direct induction caused by red filtered light was found to be neutralized by blue-green light from a very narrow range of the spec-trum. The range of the spectrum effective to neutralize the direct in-duction caused by yellow filtered light was found much wider.
2. White light of intensity lower than 5000 lux, which was inter-posed between the inducing colored light and the white test-light did not affect the direct induction caused by the colored light. At higher inten-sities of white light the direct induction was reduced, but this effect could not be identified with the neutralization of retinal induction.
3. It was confirmed that the white light stimulus, even when its intensity was raised to 30, 000lux, had no effect whatsoever upon the excitability curve for the white test-light applied subsequently.
4. It was confirmed that the capacity to produce retinal induction is greatest in a retinal area 15° from the fovea.
5. Some experiments suggesting decremental propagation of spread-ing induction were carried out.
