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Previous research found that hearing aid users experience broad binaural fusion, fusing concurrent dichotic vowels with voice pitch differences of up to an octave [Reiss and Molis (2021) J. Assoc. Res. Otolaryngol. 22(4), 443\u2013461]. This study examined whether cochlear implant (CI) users, compared to normal-hearing listeners, also exhibit abnormal fusion of concurrent double vowels in free-field conditions. 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