82%)) to establish letter discriminability matrices for the Latin alphabet.
as many tables as were readily available from the supplied paper links have been extracted and it was ensured that they were labelled for 1. modality (visual, motoric, acoustical) 2. directionality (symmetric matrix?, ∆(< a >, < d >) 3. letter set (upper case, lower case, numbers, mixed case) 4. polarity (similarity or distance) some matrices or data reported in the papers were not used, since they either analysed irrelevant data (perception in pigeons (Blough, 1985), discrimination of the Braille alphabet, (Gilmore et al., 1979)), reported a poor predictive performance (Coffin, 1978), provided incomplete data (Uttal, 1969), featured very few observations (Banister, 1927) or were hardly extractable due to age or condition of the pdfs.