Bonne NX, et al. - In this single center retrospective study, researchers carried out a long term evaluation of the localization capabilities in the horizontal plane of single-sided deaf patients fitted with a BAHA device. Participants in the study were 21 adults with single-sided deafness (SSD) with normal hearing in the contralateral ear (pure tone average <20 dB, SDS >90%) rehabilitated from 2003 to 2012 on the deaf side with a Cochlear BAHA device over an 8-year median follow-up. Findings revealed that improving sound localization for some SSD patients in the horizontal plane is likely related to altered processing of monaural spectral cues. It takes time to learn how to use azimuth-dependent spectral cues. For studies investigating sound localization performance, long-term follow-up should be considered.