INTERMITTENT LIGHT STIMULATION AND THE DUPLICITY THEORY OF VISION
This extract was created in the absence of an abstract.
Excerpt
I.
The most consistently revealing generalization about vision comes from Max Schultze's (1866) recognition that the vertebrate retina in general and the human retina in particular contain two different types of receptor, rods and cones, and that these have different visual functions. Further physiological implications of this double retinal structure were drawn by Parinaud (1885) and by von Kries (for summary see v. Kries, 1929), and the total conception has formed the Duplicity Theory which ascribes the characteristics of colorless vision at low intensities to the rods, and of color vision at high intensities to the cones.
With the years the evidence for this generalization has become more extensive and impressive because of the variety of visual measurements which have found their simple explanation in terms of it. We wish to add to this body of data the information gained from the work on flicker which has been going on...
