December 2008
Volume 8, Issue 17
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OSA Fall Vision Meeting Abstract  |   December 2008
Comparison of influences of local and lateral cone modulation on rod thresholds
Author Affiliations
  • Hao Sun
    Dept. of Optometry and Visual Sciences, Buskerud University College, Kongsberg, Norway
  • Rigmor C. Baraas
    Dept. of Optometry and Visual Sciences, Buskerud University College, Kongsberg, Norway
Journal of Vision December 2008, Vol.8, 84. doi:10.1167/8.17.84
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      Hao Sun, Rigmor C. Baraas; Comparison of influences of local and lateral cone modulation on rod thresholds. Journal of Vision 2008;8(17):84. doi: 10.1167/8.17.84.

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Abstract

The spatial properties of rod-cone interaction was investigated with a 2-channel 4-primary Maxwellian view system . Rod and cone isolating stimuli were generated using the method of silent substitution. Detection thresholds for a 100 ms 1 deg diameter rod pulse were measured at different phases of a 0.5 Hz cone-modulating background. The background was modulated either along L+M luminance or L−M chromatic axis, and it covered 1) a 1 deg diameter field same as the test, 2) a 12 deg diameter large field, or 3) an annulus surrounding the test (1 deg inner diameter and 12 deg outer diameter). The stimulus was presented at 6 deg extra-foveal (nasal). The mean luminance was either 200 photopic td (98 scotopic td) or 20 photopic td (9.8 scotopic td). The mean chromaticity was (0.8, 0.33. 0.67) in (s, m, l) coordinate. Results show that rod thresholds are clearly modulated by the cone-modulating background, and the interaction is mainly local; the effect of lateral cone modulation on rod threshold is weak. This is consistent with rod thresholds being mediated by rod signals converged to the cone pathway via rod-cone gap junction. The overall influence of L-M chromatic carrier on rod threshold is weaker than L+M luminance carrier, which is consistent with weaker rod inputs to parvecellular pathways than magnocellular pathways (Lee., Smith, Pokorny, & Kremers, 1997).

BuckS. (2004). Rod-Cone Interactions in Human Vision, in the Visual Neurosciences, Vol. 1, Ed. ChalupaL. M.WernerJ. S. (Eds.), Cambridge, Massachusetts: The MIT Press, pp. 863–878.

LeeB.B.SmithV. C.PokornyJ.KremersJ. (1997). Rod inputs to macaque ganglion cells. Vision Research, 37, 2813–2828.

Sun, H. Baraas, R. C. (2008). Comparison of influences of local and lateral cone modulation on rod thresholds [Abstract]. Journal of Vision, 8(17):84, 84a, http://journalofvision.org/8/17/84/, doi:10.1167/8.17.84. [CrossRef]
Footnotes
 We thank Joel Pokorny and Jules Quinlan for building the Maxwellian view system, and thank Dingcai Cao and Linda Glennie for supports in software. This work is supported by the Norwegian Research Council Grant No.176541/V10 and 182768/V10.
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