Different speakers may pronounce the same sounds very differently, yet listeners have little difficulty perceiving speech accurately. Recent research suggests that listeners adjust their preexisting phonemic categories to accommodate speakers' pronunciations ("perceptual learning"). In some cases, these adjustments appear to reflect general…

In two experiments, naive participants took turns telling each other to click on a target picture while gaze was monitored. Critical trials included a "contrast" picture that differed from the target only in size. In both experiments, the timing of speakers' fixations on the contrast predicted whether the contrast was encoded in a phrase with a…