In studying sensitivity to facial differences, researchers used three types of facial stimuli: all test samples were presented close to life-size and displayed either variations in eye and mouth shape (set a), variations in facial contours (set b), or variations in the spacing of the eyes and the eyes and mouth (set c). Patients who experienced early visual deprivation caused by congenital cataracts (treated in infancy) had trouble discriminating between faces in the spacing set (c)
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