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  1. H. v. Helmholtz, Physiol. Optik, second edition, 444–458; Zeit. f. Psych. Physiol. Sinnesorgane 2, 1–30; 3, 1–20, 517 (1891); Akad. der Wiss. Berlin 1071–1083 (1891); Wiss. Abhandlungen 3, 407–475 (Leipzig, 1895). Erwin Schrödinger, Ann. d. Physik 63, 481–520 (1920). Ludwik Silberstein, J. Opt. Soc. Am. 28, 62–85 (1938).
  2. H. Laurens and W. F. Hamilton, Am. J. Physiol. 65, 547 (1923). W. D. Wright and F. H. G. Pitt, Proc. Phys. Soc. 46, 459–468 (1934). W. D. Wright, Proc. Phys. Soc. 53, 96 (1941).
  3. Hecht, Peskin, and Patt, in J. Gen. Physiol. 22, 7–19 (1938), showed that this is approximately true for cone vision, i.e., for luminance much greater than 0.01 footlambert. They reported for blue, green, yellow, orange, and red "a maximum variation of about ten per cent from the mean, which is probably of no importance." They showed that the assumption is certainly not correct for rod vision, i.e., for luminance much less than 0.01 foot-lambert.
  4. No experimental tests of this assumption have been reported. Although it is implicit in most guesses about the way in which sub-liminal differences of luminance and chromaticity are compounded, this assumption has not previously been stated explicitly. It is not easy to devise an experimental procedure adequate for testing this assumption. The ultimate test may have to be indirect, a verification of predictions based on this and better established hypotheses.
  5. L. C. Martin, F. L. Warburton, and W. J. Morgan, Medical Research Council, Special Report Series No. 188 (H. M. Stationery Office, London, 1933). D. L. MacAdam, J. Opt. Soc. Am. 32, 247–274 (1942). L. Silberstein and D. L. MacAdam, ibid. 35, 32–39 (1945).
  6. Parry Moon and D. E. Spencer, J. Opt. Soc. Am. 33, 260–269 (1943). G. A. Fry, J. Opt. Soc. Am. 35, 114–135 (1945).
  7. D. L. MacAdam, J. Opt. Soc. Am. 33, 675–679 (1943); J. Frank. Inst. 238, 195–210 (1944); J. Opt. Soc. Am. 35, 616–617 (1945). A. W. Wundheiler, J. Opt. Soc. Am. 35, 767–771 (1945).

Hamilton, W. F.

H. Laurens and W. F. Hamilton, Am. J. Physiol. 65, 547 (1923). W. D. Wright and F. H. G. Pitt, Proc. Phys. Soc. 46, 459–468 (1934). W. D. Wright, Proc. Phys. Soc. 53, 96 (1941).

Helmholtz, H. v.

H. v. Helmholtz, Physiol. Optik, second edition, 444–458; Zeit. f. Psych. Physiol. Sinnesorgane 2, 1–30; 3, 1–20, 517 (1891); Akad. der Wiss. Berlin 1071–1083 (1891); Wiss. Abhandlungen 3, 407–475 (Leipzig, 1895). Erwin Schrödinger, Ann. d. Physik 63, 481–520 (1920). Ludwik Silberstein, J. Opt. Soc. Am. 28, 62–85 (1938).

Laurens, H.

H. Laurens and W. F. Hamilton, Am. J. Physiol. 65, 547 (1923). W. D. Wright and F. H. G. Pitt, Proc. Phys. Soc. 46, 459–468 (1934). W. D. Wright, Proc. Phys. Soc. 53, 96 (1941).

MacAdam, D. L.

D. L. MacAdam, J. Opt. Soc. Am. 33, 675–679 (1943); J. Frank. Inst. 238, 195–210 (1944); J. Opt. Soc. Am. 35, 616–617 (1945). A. W. Wundheiler, J. Opt. Soc. Am. 35, 767–771 (1945).

Martin, L. C.

L. C. Martin, F. L. Warburton, and W. J. Morgan, Medical Research Council, Special Report Series No. 188 (H. M. Stationery Office, London, 1933). D. L. MacAdam, J. Opt. Soc. Am. 32, 247–274 (1942). L. Silberstein and D. L. MacAdam, ibid. 35, 32–39 (1945).

Moon, Parry

Parry Moon and D. E. Spencer, J. Opt. Soc. Am. 33, 260–269 (1943). G. A. Fry, J. Opt. Soc. Am. 35, 114–135 (1945).

Morgan, W. J.

L. C. Martin, F. L. Warburton, and W. J. Morgan, Medical Research Council, Special Report Series No. 188 (H. M. Stationery Office, London, 1933). D. L. MacAdam, J. Opt. Soc. Am. 32, 247–274 (1942). L. Silberstein and D. L. MacAdam, ibid. 35, 32–39 (1945).

Spencer, D. E.

Parry Moon and D. E. Spencer, J. Opt. Soc. Am. 33, 260–269 (1943). G. A. Fry, J. Opt. Soc. Am. 35, 114–135 (1945).

Warburton, F. L.

L. C. Martin, F. L. Warburton, and W. J. Morgan, Medical Research Council, Special Report Series No. 188 (H. M. Stationery Office, London, 1933). D. L. MacAdam, J. Opt. Soc. Am. 32, 247–274 (1942). L. Silberstein and D. L. MacAdam, ibid. 35, 32–39 (1945).

Other (7)

H. v. Helmholtz, Physiol. Optik, second edition, 444–458; Zeit. f. Psych. Physiol. Sinnesorgane 2, 1–30; 3, 1–20, 517 (1891); Akad. der Wiss. Berlin 1071–1083 (1891); Wiss. Abhandlungen 3, 407–475 (Leipzig, 1895). Erwin Schrödinger, Ann. d. Physik 63, 481–520 (1920). Ludwik Silberstein, J. Opt. Soc. Am. 28, 62–85 (1938).

H. Laurens and W. F. Hamilton, Am. J. Physiol. 65, 547 (1923). W. D. Wright and F. H. G. Pitt, Proc. Phys. Soc. 46, 459–468 (1934). W. D. Wright, Proc. Phys. Soc. 53, 96 (1941).

Hecht, Peskin, and Patt, in J. Gen. Physiol. 22, 7–19 (1938), showed that this is approximately true for cone vision, i.e., for luminance much greater than 0.01 footlambert. They reported for blue, green, yellow, orange, and red "a maximum variation of about ten per cent from the mean, which is probably of no importance." They showed that the assumption is certainly not correct for rod vision, i.e., for luminance much less than 0.01 foot-lambert.

No experimental tests of this assumption have been reported. Although it is implicit in most guesses about the way in which sub-liminal differences of luminance and chromaticity are compounded, this assumption has not previously been stated explicitly. It is not easy to devise an experimental procedure adequate for testing this assumption. The ultimate test may have to be indirect, a verification of predictions based on this and better established hypotheses.

L. C. Martin, F. L. Warburton, and W. J. Morgan, Medical Research Council, Special Report Series No. 188 (H. M. Stationery Office, London, 1933). D. L. MacAdam, J. Opt. Soc. Am. 32, 247–274 (1942). L. Silberstein and D. L. MacAdam, ibid. 35, 32–39 (1945).

Parry Moon and D. E. Spencer, J. Opt. Soc. Am. 33, 260–269 (1943). G. A. Fry, J. Opt. Soc. Am. 35, 114–135 (1945).

D. L. MacAdam, J. Opt. Soc. Am. 33, 675–679 (1943); J. Frank. Inst. 238, 195–210 (1944); J. Opt. Soc. Am. 35, 616–617 (1945). A. W. Wundheiler, J. Opt. Soc. Am. 35, 767–771 (1945).

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