Computational modelling of word-naming processes has suggested that th
e frequency of spelling-to-sound correspondence facilitates print-to-s
ound translation time and has given rise to predictions that are suppo
rted by empirical data (Brown, 1987a). This contrasts with earlier cla
ims that regularity is the only spelling-to-sound correspondence attri
bute that determines word-naming time. Here we report further evidence
for the effects of the frequency of spelling-to-sound correspondences
on word-naming latency. Experiment 1 excludes alternative, orthograph
ic neighbourhood interpretations of the putative spelling-to-sound eff
ects. Experiment 2 shows that a word's number of rhymes does not affec
t naming latency for that word, thus excluding explanations in terms o
f output phonology. Experiment 3 replicates earlier findings that a wo
rd's spelling-to-sound enemies, as well as friends, determine naming l
atency. Thus both the regularity and the frequency of spelling-to-soun
d correspondences influence word-naming time. The implications for mod
els of oral reading processes are explored.