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• W2084882424 abstract "Abstract Contrast sensitivity improves with the area of a sine-wave grating, but why? Here we assess this phenomenon against contemporary models involving spatial summation, probability summation, uncertainty, and stochastic noise. Using a two-interval forced-choice procedure we measured contrast sensitivity for circular patches of sine-wave gratings with various diameters that were blocked or interleaved across trials to produce low and high extrinsic uncertainty, respectively. Summation curves were steep initially, becoming shallower thereafter. For the smaller stimuli, sensitivity was slightly worse for the interleaved design than for the blocked design. Neither area nor blocking affected the slope of the psychometric function. We derived model predictions for noisy mechanisms and extrinsic uncertainty that was either low or high. The contrast transducer was either linear (c1.0) or nonlinear (c2.0), and pooling was either linear or a MAX operation. There was either no intrinsic uncertainty, or it was fixed or proportional to stimulus size. Of these 10 canonical models, only the nonlinear transducer with linear pooling (the noisy energy model) described the main forms of the data for both experimental designs. We also show how a cross-correlator can be modified to fit our results and provide a contemporary presentation of the relation between summation and the slope of the psychometric function." @default.
• W2084882424 created "2016-06-24" @default.
• W2084882424 creator A5057925236 @default.
• W2084882424 creator A5071266633 @default.
• W2084882424 date "2012-10-17" @default.
• W2084882424 modified "2023-09-27" @default.
• W2084882424 title "Theory and data for area summation of contrast with and without uncertainty: Evidence for a noisy energy model" @default.
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• W2084882424 doi "https://doi.org/10.1167/12.11.9" @default.
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