Binaural fusion and mis-identification of spatially separated concurrent vowels by cochlear implant users

Excess binaural fusion can be problematic for listeners in noisy environments, leading to fusion of speech from multiple talkers. 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), 443-461]....

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Cochlear implant users show elevated binaural fusion errors with spatially separated concurrent sounds, which may partly explain their poorer performance in cocktail-party listening situations; audiologists should factor this perceptual limitation into realistic expectations-setting and rehabilitation planning.

Understanding why cochlear implant users struggle in complex listening environments — beyond signal processing limitations — can guide development of better auditory training programs and future device algorithms.

1. 01CI users show more 'binaural fusion' errors than hearing aid users — incorrectly merging two separate sound sources into one.
2. 02The effect was observed with spatially separated concurrent vowels in noisy conditions.
3. 03This perceptual error is distinct from, and adds to, known speech-in-noise difficulties for CI users.
4. 04Hearing aid users served as a comparison group, highlighting a CI-specific perceptual deficit.
5. 05Findings have implications for auditory rehabilitation and realistic outcome counseling.

PMID

42599163

DOI

10.1121/10.0044921.

Journal

Journal of the Acoustical Society of America

Publication type

research_article

Evidence level

3

Population

Cochlear implant users and hearing aid users tested in noisy listening conditions

Intervention

Perception of spatially separated concurrent vowels in noise

Comparator

Hearing aid users