November 2002
Volume 2, Issue 7
Free
Vision Sciences Society Annual Meeting Abstract  |   November 2002
Which colours do not invoke the high-spatial-frequency tritanopia effect?
Author Affiliations
  • Alexander D. Logvinenko
    The Queen's University of Belfast, UK
Journal of Vision November 2002, Vol.2, 145. doi:10.1167/2.7.145
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      Alexander D. Logvinenko, Sara J. Hutchinson; Which colours do not invoke the high-spatial-frequency tritanopia effect?. Journal of Vision 2002;2(7):145. doi: 10.1167/2.7.145.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

A rectangular achromatic grating presented against a coloured background may appear tinged with either yellow-green (e.g., when against a yellow background), or blue (e.g., when against a pink background) provided its spatial frequency is high enough. This colour illusion, which is referred to as high-spatial-frequency tritanopia (HSFT), can be observed against backgrounds of only a limited set of colours. We investigated which colours do not produce HSFT. Such a no-illusion set (NIS) of colours is quite indicative of a possible colour mechanism of HSFT. If, as recently suggested (Hutchinson and Logvinenko, 2001 Perception 30 Supplement, p. 8), it is a result of poorer spatial characteristics of either (i) the opponent yellow-blue linear colour channel, or (ii) two unipolar (e.g., yellow and blue) linear channels each of which is followed by a rectifier, the NIS should be either (i) a plane, or (ii) a dihedral, through an achromatic locus, respectively. Generally, any explicit quantitative model of the S-cone pathway makes a specific prediction of the NIS. We have explored the equi-luminant and ML planes in the SML cone contrast space for a grating of 10.1 c/deg. In the ML-plane the NIS was found to be a narrow strip through the origin, with an angle of approximately 65 deg with the M-axis. In the equi-luminant plane the NIS was found to be a curvilinear line for M − L < 0. However, when M − L > 0 the NIS was not a line but a whole curvilinear sector. These results clearly indicate that at least two non-linear unipolar post-receptor chromatic mechanisms, making up an opponent pair, are involved in producing HSFT. Both mechanisms are driven by a difference between a S-cone input and a linear combination of M- and L-cone inputs transformed by static non-linearity. With both being half-wave rectified, one mechanism, produces a bluish illusory colour and the other produces a yellow-greenish illusory colour.

Logvinenko, A. D., Hutchinson, S. J.(2002). Which colours do not invoke the high-spatial-frequency tritanopia effect? [Abstract]. Journal of Vision, 2( 7): 145, 145a, http://journalofvision.org/2/7/145/, doi:10.1167/2.7.145. [CrossRef]
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