Rod participation in the 'blue' mechanism and its effect on colour matching.

Abstract The idea that “rod colour” is blue under photopic conditions is used to account for discrepancies caused by rods in large field colour matching. Discrepancies are accounted for when luminance level is changed, when a matching stimulus is altered in colour and when field trials are undertaken. Because of this rod intrusion, trichromatic matches are often not suitable for an additive system of large field colorimetry: a matching technique suited to such a system is discussed. An enquiry into why “rod colour” should be blue, together with an examination of the similarities and dissimilarities of rods and “blue cones”, leads to the further suggestion that rods and “blue cones” exist separately but share a neural pathway. Following up this idea leads to a new suggestion regarding the origin of Maxwell's spot.

[1]  W S STILES.  N.P.L. COLOUR-MATCHING INVESTIGATION: ADDENDUM ON ADDITIVITY. , 1963, Optica acta.

[2]  R. Weale,et al.  The aging eye , 1963 .

[3]  R. Weale,et al.  Spectral sensitivity and wave‐length discrimination of the peripheral retina , 1953, The Journal of physiology.

[4]  Reanalysis of the NRC Field Trials of Color-Matching Functions , 1964 .

[5]  J. Moreland.  Threshold measurements of the blue arcs phenomenon. , 1968, Vision research.

[6]  W. Stiles,et al.  Saturation of the Rod Mechanism of the Retina at High Levels of Stimulation , 1954 .

[7]  W. Stiles,et al.  Field Trial of 10° Color-Mixture Functions , 1960 .

[8]  H R Blackwell,et al.  Rod and cone receptor mechanisms in typical and atypical congenital achromatopsia , 1961 .

[9]  D. B. Judd.  Least retinal illumination by spectral light required to evoke the ""blue arcs of the retina"" , 1929 .

[10]  H. Dartnall,et al.  The interpretation of spectral sensitivity curves. , 1953, British medical bulletin.

[11]  F. Clarke.  Extra-foveal Colour Metrics , 1960 .

[12]  W. D. Wright,et al.  Researches on normal and defective colour vision , 1947 .

[13]  G. Brindley,et al.  The summation areas of human colour‐receptive mechanisms at increment threshold , 1954, The Journal of physiology.

[14]  F. Clarke.  FURTHER STUDIES OF EXTRA-FOVEAL COLOUR METRICS. , 1963, Optica acta.

[15]  W. Stiles,et al.  N.P.L. Colour-matching Investigation: Final Report (1958) , 1959 .

[16]  H. Dartnall.  VISUAL PIGMENTS OF COLOUR VISION , 1960 .

[17]  Colorimetry in Parafoveal Fields.* II. Additivity Failure , 1964 .

[18]  The additivity of large-field colour matching functions. , 1967, Vision research.

[19]  Additivity of Colour Equations: II , 1953 .

[20]  B H Crawford.  Colour matching and adaptation. , 1965, Vision research.

[21]  J. Moreland,et al.  Colour Perception with the Peripheral Retina , 1959 .

[22]  James Clerk Maxwell,et al.  On the theory of compound colours, and the relations of the colours of the spectrum , 1860, Proceedings of the Royal Society of London.

[23]  The after‐effects of a white light stimulus , 1960, The Journal of physiology.

[24]  K. Ruddock,et al.  The Purkinje shift. , 1969, Vision Research.

[25]  K. Ruddock.  EVIDENCE FOR MACULAR PIGMENTATION FROM COLOUR MATCHING DATA. , 1963, Vision research.

[26]  D. A. Palmer,et al.  Large-field color matching and adaptation. , 1968, Journal of the Optical Society of America.

[27]  Field Trial of the 1959 CIE Supplementary Standard Observer Proposal , 1964 .

[28]  R. L. Valois,et al.  Analysis of response patterns of LGN cells. , 1966, Journal of the Optical Society of America.

[29]  E. A. Hough.  The spectral sensitivity functions for parafoveal vision. , 1968, Vision research.

[30]  G Wald,et al.  HUMAN VISION AND THE SPECTRUM. , 1945, Science.

[31]  E. Willmer.  Human colour vision and the perception of blue. , 1961, Journal of theoretical biology.

[32]  K. L. Kelly.  Observer differences in color-mixture functions studied by means of a pair of metameric grays , 1958 .

[33]  W. Riddell.  A PEDIGREE OF HEREDITARY STATIONARY SEX-LINKED NIGHT BLINDNESS , 1940 .