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  1. To appear in a later number of this JOURNAL.
  2. See, for example, Hess C. v. Beiträge zur Kenntnis des Lichtsinnes bei Wirbellosen. Arch. f. d. ges. Physiol., 177, 57–109; 1920.
  3. See, for example, Schnurmann, F. Untersuchungen an Elritzen über Farbenwechsel und Lichtsinn der Fische. Zeitsch. f. Biol, 71, 69–98; 1920.
  4. See Hess, C. v. Die Rotgrünblindheiten. Arch. f. d. ges. Physiol, 185, 147–164, 1920.
  5. Ferree and Rand find that red, yellow and blue, but not green, can be perceived as chromatic at the extreme periphery with a sufficient intensity of light. See Ferree, C. E. and Rand, G. The Absolute Limit of Color Sensitivity and the Effect of Intensity of Light on the Apparent Limit. Psychol. Rev., 27, 1–23; 1920.
  6. See Parsons, J. H. An Introduction to the Study of Color Vision, p. 71, 1915.
  7. The proposition that the acuity index depends upon the brightness value of a stimulus, independently of its color, was clearly enunciated by Helmholtz in several places, and had been assumed by previous workers such as Macé de Lapinay and Nicati who employed equality of acuity as a criterion of equality of brightness. Repeated attempts have been made to employ an acuity test as a basis for heterochromatic photometry. König regarded his very systematic work on this subject as clearly substantiating Helmholtz’s original conjecture. See König, A. Die Abhangigkeit der Sehscharfe von der Beleutungsintensität, Gesammelte Abhandlungen zur Physiologischen Optik. 1903, p. 391. However, the problem is much complicated by uncertainty in the conditions or method of observation: the proportions of rod and cone vision involved, the exact visibility curves of the observers, and the exact importance of the purely physical chromatic aberration effects within the eye. Dr. Ferree finds a very considerable dependence of acuity upon chroma even when rod vision is excluded. Whether his results, in common with those of Luckiesh, can be explained in terms of the refractive properties of the eye or whether they will require a retinal basis is at present uncertain.
  8. Luckiesh, M. Color and Its Applications, pp. 130–137, 1915.
  9. Parsons, J. H., op. cit., p. 96.
  10. Ives, H. E. Studies in the Photometry of Lights of Different Colors. II. Spectral Luminosity Curves by the Method of Critical Flicker Frequency. Phil. Mag., 24, p. 357–362, 1912.
  11. McDougall, W. The Variation of the Intensity of Visual Sensation with the Duration of the Stimulus. British Jour, of Psychol., 1, p. 189, 1904
  12. See Nutting, P. G. The Luminous Equivalent of Radiation. Bull. of the Bur. of Stands., 5, p. 293, 1908.
  13. Bills, M. A. The Lag of Visual Sensation and Its Relation to Wave-Length and Intensity of Light. Psychological Review Monographs, 28, No. 5.
  14. See Nutting, P. G. loc. cit., p. 286.
  15. Ives, H. E. Studies in the Photometry of Lights of Different Colors. IV. The Addition of Luminosity to Different Colors. Phil. Mag. 24, pp. 845–853, 1912.
  16. Troland, L. T. Apparent Brightness; Its Conditions and Properties. Trans. of the Illum. Eng. Soc. 5, p. 954; 1916.
  17. For expositions of these two theories see Parsons, J. H., op. cit., Part III.
  18. See Abney, W. de W. Researches in Color Vision and the Trichromatic Theory, 1913.
  19. See Troland, L. T. loc. cit., p. 955–957.
  20. Abney, W. de W. op. cit., pp. 371–380.
  21. As yet unpublished.
  22. Troland, L. T. Preliminary Note; The Influence of Changes of Illumination upon After-images. Amer. Jour. of Psychol., 28, pp. 497–503; 1917.
  23. In the Young-Helmholtz Theory, as interpreted by the majority of its exponents, this uniqueness of the red would probably consist in its being the only chromatic process which is capable of being excited in isolation from others.
  24. Cf. Parsons, J. H., op. cit., p. 270.
  25. Schjelderup, H. K. Zur Theorie der Farbenempfindungen. Zeits. für Sinnesphysiol. 51, 19–45; 1920.

1920

See, for example, Hess C. v. Beiträge zur Kenntnis des Lichtsinnes bei Wirbellosen. Arch. f. d. ges. Physiol., 177, 57–109; 1920.

See, for example, Schnurmann, F. Untersuchungen an Elritzen über Farbenwechsel und Lichtsinn der Fische. Zeitsch. f. Biol, 71, 69–98; 1920.

See Hess, C. v. Die Rotgrünblindheiten. Arch. f. d. ges. Physiol, 185, 147–164, 1920.

Ferree and Rand find that red, yellow and blue, but not green, can be perceived as chromatic at the extreme periphery with a sufficient intensity of light. See Ferree, C. E. and Rand, G. The Absolute Limit of Color Sensitivity and the Effect of Intensity of Light on the Apparent Limit. Psychol. Rev., 27, 1–23; 1920.

Schjelderup, H. K. Zur Theorie der Farbenempfindungen. Zeits. für Sinnesphysiol. 51, 19–45; 1920.

1917

Troland, L. T. Preliminary Note; The Influence of Changes of Illumination upon After-images. Amer. Jour. of Psychol., 28, pp. 497–503; 1917.

1916

Troland, L. T. Apparent Brightness; Its Conditions and Properties. Trans. of the Illum. Eng. Soc. 5, p. 954; 1916.

1915

See Parsons, J. H. An Introduction to the Study of Color Vision, p. 71, 1915.

Luckiesh, M. Color and Its Applications, pp. 130–137, 1915.

1913

See Abney, W. de W. Researches in Color Vision and the Trichromatic Theory, 1913.

1912

Ives, H. E. Studies in the Photometry of Lights of Different Colors. IV. The Addition of Luminosity to Different Colors. Phil. Mag. 24, pp. 845–853, 1912.

Ives, H. E. Studies in the Photometry of Lights of Different Colors. II. Spectral Luminosity Curves by the Method of Critical Flicker Frequency. Phil. Mag., 24, p. 357–362, 1912.

1908

See Nutting, P. G. The Luminous Equivalent of Radiation. Bull. of the Bur. of Stands., 5, p. 293, 1908.

1904

McDougall, W. The Variation of the Intensity of Visual Sensation with the Duration of the Stimulus. British Jour, of Psychol., 1, p. 189, 1904

Abney, W. de W.

See Abney, W. de W. Researches in Color Vision and the Trichromatic Theory, 1913.

Abney, W. de W. op. cit., pp. 371–380.

Bills, M. A.

Bills, M. A. The Lag of Visual Sensation and Its Relation to Wave-Length and Intensity of Light. Psychological Review Monographs, 28, No. 5.

Ferree, C. E.

Ferree and Rand find that red, yellow and blue, but not green, can be perceived as chromatic at the extreme periphery with a sufficient intensity of light. See Ferree, C. E. and Rand, G. The Absolute Limit of Color Sensitivity and the Effect of Intensity of Light on the Apparent Limit. Psychol. Rev., 27, 1–23; 1920.

Ives, H. E.

Ives, H. E. Studies in the Photometry of Lights of Different Colors. II. Spectral Luminosity Curves by the Method of Critical Flicker Frequency. Phil. Mag., 24, p. 357–362, 1912.

Ives, H. E. Studies in the Photometry of Lights of Different Colors. IV. The Addition of Luminosity to Different Colors. Phil. Mag. 24, pp. 845–853, 1912.

Luckiesh, M.

Luckiesh, M. Color and Its Applications, pp. 130–137, 1915.

McDougall, W.

McDougall, W. The Variation of the Intensity of Visual Sensation with the Duration of the Stimulus. British Jour, of Psychol., 1, p. 189, 1904

Nutting, P. G.

See Nutting, P. G. The Luminous Equivalent of Radiation. Bull. of the Bur. of Stands., 5, p. 293, 1908.

See Nutting, P. G. loc. cit., p. 286.

Parsons, J. H.

See Parsons, J. H. An Introduction to the Study of Color Vision, p. 71, 1915.

Parsons, J. H., op. cit., p. 96.

Cf. Parsons, J. H., op. cit., p. 270.

For expositions of these two theories see Parsons, J. H., op. cit., Part III.

Rand, G.

Ferree and Rand find that red, yellow and blue, but not green, can be perceived as chromatic at the extreme periphery with a sufficient intensity of light. See Ferree, C. E. and Rand, G. The Absolute Limit of Color Sensitivity and the Effect of Intensity of Light on the Apparent Limit. Psychol. Rev., 27, 1–23; 1920.

Schjelderup, H. K.

Schjelderup, H. K. Zur Theorie der Farbenempfindungen. Zeits. für Sinnesphysiol. 51, 19–45; 1920.

Schnurmann, F.

See, for example, Schnurmann, F. Untersuchungen an Elritzen über Farbenwechsel und Lichtsinn der Fische. Zeitsch. f. Biol, 71, 69–98; 1920.

Troland, L. T.

Troland, L. T. Preliminary Note; The Influence of Changes of Illumination upon After-images. Amer. Jour. of Psychol., 28, pp. 497–503; 1917.

Troland, L. T. Apparent Brightness; Its Conditions and Properties. Trans. of the Illum. Eng. Soc. 5, p. 954; 1916.

See Troland, L. T. loc. cit., p. 955–957.

Other

To appear in a later number of this JOURNAL.

See, for example, Hess C. v. Beiträge zur Kenntnis des Lichtsinnes bei Wirbellosen. Arch. f. d. ges. Physiol., 177, 57–109; 1920.

See, for example, Schnurmann, F. Untersuchungen an Elritzen über Farbenwechsel und Lichtsinn der Fische. Zeitsch. f. Biol, 71, 69–98; 1920.

See Hess, C. v. Die Rotgrünblindheiten. Arch. f. d. ges. Physiol, 185, 147–164, 1920.

Ferree and Rand find that red, yellow and blue, but not green, can be perceived as chromatic at the extreme periphery with a sufficient intensity of light. See Ferree, C. E. and Rand, G. The Absolute Limit of Color Sensitivity and the Effect of Intensity of Light on the Apparent Limit. Psychol. Rev., 27, 1–23; 1920.

See Parsons, J. H. An Introduction to the Study of Color Vision, p. 71, 1915.

The proposition that the acuity index depends upon the brightness value of a stimulus, independently of its color, was clearly enunciated by Helmholtz in several places, and had been assumed by previous workers such as Macé de Lapinay and Nicati who employed equality of acuity as a criterion of equality of brightness. Repeated attempts have been made to employ an acuity test as a basis for heterochromatic photometry. König regarded his very systematic work on this subject as clearly substantiating Helmholtz’s original conjecture. See König, A. Die Abhangigkeit der Sehscharfe von der Beleutungsintensität, Gesammelte Abhandlungen zur Physiologischen Optik. 1903, p. 391. However, the problem is much complicated by uncertainty in the conditions or method of observation: the proportions of rod and cone vision involved, the exact visibility curves of the observers, and the exact importance of the purely physical chromatic aberration effects within the eye. Dr. Ferree finds a very considerable dependence of acuity upon chroma even when rod vision is excluded. Whether his results, in common with those of Luckiesh, can be explained in terms of the refractive properties of the eye or whether they will require a retinal basis is at present uncertain.

Luckiesh, M. Color and Its Applications, pp. 130–137, 1915.

Parsons, J. H., op. cit., p. 96.

Ives, H. E. Studies in the Photometry of Lights of Different Colors. II. Spectral Luminosity Curves by the Method of Critical Flicker Frequency. Phil. Mag., 24, p. 357–362, 1912.

McDougall, W. The Variation of the Intensity of Visual Sensation with the Duration of the Stimulus. British Jour, of Psychol., 1, p. 189, 1904

See Nutting, P. G. The Luminous Equivalent of Radiation. Bull. of the Bur. of Stands., 5, p. 293, 1908.

Bills, M. A. The Lag of Visual Sensation and Its Relation to Wave-Length and Intensity of Light. Psychological Review Monographs, 28, No. 5.

See Nutting, P. G. loc. cit., p. 286.

Ives, H. E. Studies in the Photometry of Lights of Different Colors. IV. The Addition of Luminosity to Different Colors. Phil. Mag. 24, pp. 845–853, 1912.

Troland, L. T. Apparent Brightness; Its Conditions and Properties. Trans. of the Illum. Eng. Soc. 5, p. 954; 1916.

For expositions of these two theories see Parsons, J. H., op. cit., Part III.

See Abney, W. de W. Researches in Color Vision and the Trichromatic Theory, 1913.

See Troland, L. T. loc. cit., p. 955–957.

Abney, W. de W. op. cit., pp. 371–380.

As yet unpublished.

Troland, L. T. Preliminary Note; The Influence of Changes of Illumination upon After-images. Amer. Jour. of Psychol., 28, pp. 497–503; 1917.

In the Young-Helmholtz Theory, as interpreted by the majority of its exponents, this uniqueness of the red would probably consist in its being the only chromatic process which is capable of being excited in isolation from others.

Cf. Parsons, J. H., op. cit., p. 270.

Schjelderup, H. K. Zur Theorie der Farbenempfindungen. Zeits. für Sinnesphysiol. 51, 19–45; 1920.

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