Boles, D.B., & Clifford, J.E. (1989). An upper- and
lowercase alphabetic similarity matrix, with derived
generation similarity values. Behavior Research Methods,
Instruments, & Computers, 21, 579-586.
Summary:
All pairs of uppercase and lowercase were judged by
participants for their visual similarity.
Procedure:
Each letter pairs was presented horizontally.
Participants rated the pairs on visual similarity,
with 1 representing low similarity and 5 representing high similarity.
Stimuli
The characters were not italicized and were without serifs.
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