The Relationship Between Intensity Coding and Binaural Sensitivity in Adults With Cochlear Implants.

The study included only 11 adults, and the main signal-detection analyses used eight participants, so the findings may not generalise to all bilateral CI users. The tests used single pitch-matched electrode pairs and laboratory tone-in-noise tasks, not everyday clinical processors or speech-in-noise outcomes. The procedure for setting maximum levels changed after the first few participants, and some participants were tested at lower comfortable levels, which reduced binaural improvement. The study did not test monaural signal detection in each ear, so it could not tell whether differences between dynamic ranges caused interference or simply reduced bilateral benefit. Dynamic range and timing sensitivity were associated, but the paper did not measure nerve survival or electrode position directly, so the cause of the relationships is not established. Interaural time difference is not a cue most CI users receive with everyday clinical speech processing, so the timing results may not reflect daily listening.

The authors declared no conflicts of interest.

Do not read the tone-in-noise gain as evidence that bilateral CI users will hear speech better in noise. It was measured for a tone in noise, and the study did not test whether changing dynamic range improves listening.