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Preparation of this paper was facilitated by a grant from the National Institute on Aging (AG03209).
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Gilmore, G.C. Letters are visual stimuli: A comment on the use of confusion matrices. Perception & Psychophysics 37, 389–390 (1985). https://doi.org/10.3758/BF03211364
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DOI: https://doi.org/10.3758/BF03211364