Typical speakers with normal hearing are able to detect even small, subphonemic variations in their own speech. In healthy speakers producing their native language, auditory feedback thus plays an important role in detecting errors during speech production. The aim of my research is to understand the role of auditory feedback in populations where the representation of auditory targets is abnormal, whether because phonetic categories are new, as in second language acquisition, or because incoming acoustic information is degraded, as when filtered through a cochlear implant.