Miller-Nicely data on the auditory confusion of 16 consonant phonemes.
data("Phonemes")A symmetric matrix of the misclassification probabilities of 16 English consonant phonemes.
Miller and Nicely (1955) obtained the confusions by exposing female subjects to a series of syllables consisting of one of the 16 consonants followed by the vowel a under 17 different experimental conditions. The data provided are obtained from aggregating the six so-called flat-noise conditions in which only the speech-to-noise ratio was varied into a single matrix of misclassification frequencies.
G. A. Miller and P. E. Nicely (1955). An analysis of perceptual confusions among some English consonants. Journal of the Acoustical Society of America, 27, 338--352. tools:::Rd_expr_doi("10.1121/1.1907526").