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The perception of image smear for a target flashed during a saccade is attenuated if the target remains visible after the eye movement ends, a result that has been attributed to backward masking. In this experiment, normal observers matched the length of perceived smear in two conditions that were designed to produce comparable retinal stimulation and, therefore, similar amounts of masking. In the...
Human contrast sensitivities to gratings were measured within windows of 3, 9.1 and 61.5 deg at spatial frequencies down to the nominal frequency of 0 c/deg (i.e., a uniform field), and the resulting curves were related to the Fourier spectra of the corresponding windows and of spatial inhomogeneities in the visual pathway. The data show that sensitivity approaches an asymptote about 1.5 log units...
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