Clinical Feasibility and Familiarization Effects of Device Delay Mismatch Compensation in Bimodal CI/HA Users.
Julian Angermeier, Werner Hemmert, Stefan Zirn
PMID 37194477WHAT IT FOUND
Adjusting cochlear implant timing to match hearing aid delays instantly corrected sound localization errors in bimodal users.
The benefit was immediate and did not grow after three weeks. This used standard manufacturer delay settings, requiring no extra lab measurements.
Key findings
01Acute compensation of device delay mismatch significantly improved the trueness of sound localization (signed bias), though not precision (RMS error).
02Using manufacturer-provided hearing aid delays was feasible and resulted in localization accuracy statistically similar to using individually measured delays.
03Three weeks of familiarization to the compensated delay did not produce further significant improvements in localization accuracy compared to the acute effect.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
Small sample size (11 subjects) limits the generalizability of the findings. The study only tested one manufacturer's CI system (MED-EL), so results may not apply to other devices. Familiarization period was 3-4 weeks; longer-term adaptation effects are unknown. Improvements were seen in bias (directional accuracy) but not in RMS error (precision/scatter), limiting the overall functional benefit. Speech-in-noise benefits were not observed, so this intervention does not address all communication difficulties in bimodal users.
Declared interests
The study was funded by MED-EL, the manufacturer of the cochlear implant system used. Several authors' institutions have received research grants from MED-EL.
The easy way to misread this
Do not expect this adjustment to improve speech understanding in noise or overall localization precision (scatter). The benefit is specifically a reduction in systematic directional bias (signed bias), and it was achieved acutely without needing long-term familiarization.