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Nasal‐temporal differences in cone‐opponency in the near peripheral retina
Author(s) -
Panorgias A.,
Parry N. R. A.,
McKeefry D. J.,
Kulikowski J. J.,
Murray I. J.
Publication year - 2009
Publication title -
ophthalmic and physiological optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.147
H-Index - 66
eISSN - 1475-1313
pISSN - 0275-5408
DOI - 10.1111/j.1475-1313.2009.00666.x
Subject(s) - chromaticity , retina , eccentricity (behavior) , physics , hue , optics , mathematics , psychology , social psychology
The purpose of this study is to establish whether nasal‐temporal differences in cone photoreceptor distributions are linked to differences in colour matching performance in the two hemi‐fields. Perceived shifts in chromaticity were measured using an asymmetric matching paradigm. They were expressed in terms of hue rotations and relative saturation changes and also in terms of activation levels of L−M or S−(L+M) cone‐opponent channels. Up to 19° eccentricity there was little difference in chromaticity shifts between nasal and temporal retina for either channel. For matches beyond 19° L−M activation is significantly lower in the nasal field and the S−(L+M) channel was equally activated in both fields. The data are consistent with the asymmetric distribution of L‐ and M‐cones in the nasal and temporal retinae.