Mean ratings of graphic distinctiveness were obtained for pairs of consonants. The comparisons were between uppercase forms of different consonants, lowercase forms of different consonants, and uppercase vs lowercase forms of the same consonants. The ratings were demonstrated to have satisfactory reliability and to covary moderately well with feature-component measures of letter-pair distinctiveness.
to rate each letter pair on a 9-point scale, with I indicating high dissimilarity of a pair's graphic content
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