JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact firstname.lastname@example.org. This content downloaded from 18.104.22.168 on Fri, 17 Feb 2017 23:12:06 UTC All use subject to http://about.jstor.org/terms where (R. M. Boynton, S. R. Das, J. Gardiner, ibid., in press). 5. To do this requires very precise calibration of the optical wedges used to vary radiance. A five-channel, xenon-arc powered, Maxwell-ian-view optical system was used in this work. This apparatus and its calibration is described in detail by C. Ingling, "The receptor sensitivi-ties of receptor systems in color vision," thesis, University of Rochester (1966). 6. This assumes a unit slope of the log threshold vs. log adapting radiance (t.v.r.) function. 7. I. T. Kaplan and H. Ripps, J. Exp. Psychol.
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