F. L. Dimmick and M. R. Hubbard, Am. J. Psychol. 52, 242 (1939).
R. M. Boynton, W. Schafer, and M. E. Neun, Science 145, 666 (1964); R. M. Boynton and J. Gordon, J. Opt. Soc. Am. 55, 78 (1965); J. Krauskopf and R. Srebo, Science 150,1477 (1965); D. O. Weitzman and J. S. Kinney, J. Opt. Soc. Am. 57, 5 (1967).
H. J. McNicholas, J. Res. Natl. Bur. Std. (U. S.) 17, 955, (1936); N. E. G. Hill, Proc. Phys. Soc. (London) 59, 560 (1947); J. G. Holmes, Doc. Ophthal. 3, 240 (1949); R. M. Halsey J. Opt. Soc. Am. 49, 45 (1959).
M. Connors, J. Opt. Soc. Am. 58, 258 (1968).
E. N. Willmer, Quart. J. Exptl. Psychol. 2, 53 (1950).
E. Baumgardt, Rev. Opt. 28, 661 (1949).
W. de W. Abney and W. Watson, Phil. Trans. Roy. Soc. (London) A216, 91 (1916).
D. McL. Purdy, Brit. J. Psychol. 21, 283 (1931).
M. Dagher, A. Cruz, and L. Plaza, Natl. Phys. Lab. Symp. 8, 387 (1958).
Y. Galifret and H. Pieron, Ann. Psychol. 43-44, 231 (1942–1943).
W. J. Crozier, J. Gen. Physiol. 21, 87 (1950).
By proper hue was meant the hue normally associated with the wavelength at higher intensities.
M. A. Bouman and P. L. Walraven, J. Opt. Soc. Am. 47, 834 (1957).
The term correct hue is used throughout the text in the same manner as proper hue is described in Ref. 12. The correcthue threshold is the luminance value at which this particular hue is correctly reported 50% of the time. The term identification implies that the observer was instructed to describe most accurately the hue attributes of the stimulus from the list of possible responses. Identification is used in contrast to detection, which implies that the observer had a priori knowledge of the hue he was attempting to detect.
Chromatic threshold is the luminance value at which any hue, or any combination of hues, is reported 50% of the time.
Since absolute thresholds5,6 and hue-detection thresholds as a function of stimulus size4 have been shown to be described by two intersecting straight lines, it is reasonable to assume that a similar relationship holds for the thresholds of this study. However, since only four stimulus sizes were investigated, the data have been fitted with a single curve.
C. H. Graham and N. R. Bartlett, J. Exptl. Psychol. 24, 574 (1939).
H. G. Sperling and Y. Hsia, J. Opt. Soc. Am. 47, 707 (1957).
J. G. Holmes, Doc. Ophthal. 3, 240 (1949).
H. Pieron, Ann. Psychol. 40, 1 (1939); H. Hartridge, Phil. Trans. Roy. Soc. (London) B232, 519 (1947); W. E. K. Middleton and M. C. Holmes, J. Opt. Soc. Am. 39, 582 (1949); E. N. Willmer, J. Physiol. (London) 110, 422 (1950); G. L. Walls, Am. J. Ophthalmol. 39, 8 (1955); P. L. Walraven, J. Opt. Soc. Am. 51, 1113 (1961).
The data shown in Table III and an inspection of the responses confirm a suggestion made in an earlier study4 that for a brief exposure the 521-nm stimulus is frequently called white, while a longer exposure is more likely to be confused with blue. Observers MC and RS showed a marked rise of the number of blue or blue-green responses to the 521-nm stimulus for the 700-msec exposure; observer JS, who made no white responses, did not exhibit this tendency.
H. G. Sperling and C. L. Jolliffe, J. Opt. Soc. Am. 55, 191 (1965).
R. M. Boynton and J. Gordon; D. O. Weitzman and J. S. Kinney, see Ref. 2.