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Specific Reading Disability: Differences in Contrast Sensitivity as a Function of Spatial Frequency.

Lovegrove, W. J.; And Others – Science, 1980
Contrast thresholds for sine-wave gratings of spatial frequencies of 2, 4, 12, and 16 cycles per degree were determined for normal and disabled readers at a range of stimulus durations. The differences in sensitivity pattern across spatial frequencies was greatest at stimulus durations approximately equal to fixation durations during reading.…
Descriptors: Contrast, Disabilities, Higher Education, Reading Diagnosis