Abstract
Bimodal hearing is defined as using a cochlear implant (CI) on one ear and a hearing aid (HA) on the other ear. This study tested a model of bimodal hearing proposed by Dieudonné and Francart (2020) in 23 bimodal listeners. Firstly, the relative hearing performance of the CI and HA ears was characterized by scores for Consonant-Nucleus-Consonant (CNC) words in quiet. Secondly, Speech Reception Thresholds (SRTs) were measured for CI alone and bimodal listening, with speech (sentences) from the front, and speech-weighted noise either from the front or the HA side. Bimodal benefit (the improvement in SRT when adding a second ear to the subject’s best ear) was 1.2 dB (p < 0.001***) averaged across all subjects. However, for the subset of 18 subjects who obtained better scores with CI alone than HA alone (“CI dominant”), there was no significant bimodal benefit. For the subset of 8 CI-dominant subjects who obtained bimodal benefit when speech and noise were co-located at the front, the benefit was lost when the noise was moved to the HA side, demonstrating that binaural cues were not being used.
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