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PLoS Comput Biol. 2010 Feb 12;6(2):e1000677. doi: 10.1371/journal.pcbi.1000677.

Design of a trichromatic cone array.

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1
Department of Psychology, Saint Joseph's University, Philadelphia, Pennsylvania, USA. patrick.garrigan@sju.edu

Abstract

Cones with peak sensitivity to light at long (L), medium (M) and short (S) wavelengths are unequal in number on the human retina: S cones are rare (<10%) while increasing in fraction from center to periphery, and the L/M cone proportions are highly variable between individuals. What optical properties of the eye, and statistical properties of natural scenes, might drive this organization? We found that the spatial-chromatic structure of natural scenes was largely symmetric between the L, M and S sensitivity bands. Given this symmetry, short wavelength attenuation by ocular media gave L/M cones a modest signal-to-noise advantage, which was amplified, especially in the denser central retina, by long-wavelength accommodation of the lens. Meanwhile, total information represented by the cone mosaic remained relatively insensitive to L/M proportions. Thus, the observed cone array design along with a long-wavelength accommodated lens provides a selective advantage: it is maximally informative.

PMID:
20168996
PMCID:
PMC2820519
DOI:
10.1371/journal.pcbi.1000677
[Indexed for MEDLINE]
Free PMC Article
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