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J Opt Soc Am A Opt Image Sci Vis. 1997 Sep;14(9):2443-8.

Contrast discrimination function: spatial cuing effects.

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Institute of Ophthalmology, London, UK.


The effects of spatial cuing were measured for discrimination between an increment and a decrement on a target's pedestal contrast. Discrimination thresholds measured in the absence of a spatial cue were always higher than corresponding thresholds measured in the presence of a spatial cue, except when pedestal contrast was near zero. Uncued discrimination thresholds rose monotonically with pedestal contrast; cued discrimination thresholds formed a dipper function of pedestal contrast. A spatial-uncertainty model incorporating a nonlinear transducer produced similar results.

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