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- W2000606291 abstract "Contrast thresholds were measured for sinusoidal gratings, with Gaussian spatial and temporal envelopes, as a function of spatial extent in the presence and absence of dynamic white noise. Spatial frequencies ranged from 0.5 to 32 c/deg. Efficiency is defined as the ratio of the ideal's contrast-energy threshold to that of the observer under study, each at the same performance level. For spatial frequencies from 0.5 to 8 c/deg, efficiencies for gratings in noise ranged from 8 to 30% for widths less than one cycle, but dropped rapidly as the width was increased beyond one cycle. Spatial summation of gratings in noise resembles the performance of a cross-correlator whose template is matched to a signal about 1 cycle wide (between 1/e points). The psychometric function slope is consistent with this idea." @default.
- W2000606291 created "2016-06-24" @default.
- W2000606291 creator A5057010401 @default.
- W2000606291 date "1984-01-01" @default.
- W2000606291 modified "2023-09-26" @default.
- W2000606291 title "Spatial summation in visual noise" @default.
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- W2000606291 doi "https://doi.org/10.1016/0042-6989(84)90033-6" @default.
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