A relation was found to exist between the slopes of the branches of the Porter Graphs for a number of colors throughout the spectrum such that the slopes of the branches of each graph can be expressed as integral multiples of a common factor.
Critical frequency measurements on the tactile sensoria which show a similar relation are discussed in corroboration.
The relation is interpreted as indicating that the physiological effect measured by the critical frequency for any particular color is made up of equal elements which start off in groups from different intensity thresholds. The possibility that these elements denote the action of single end organs or associated groups of end organs is discussed in the light of the measurements made by Adrian and Zotterman on the frequency of the nerve impulses due to the stimulation of single end organs. The interpretation is conformable to the “all or none” law.
© 1927 Optical Society of AmericaFull Article | PDF Article
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