Evaluation of the Influence of Head Movement on Hearing Aid Algorithm Performance Using Acoustic Simulations.
Maartje M E Hendrikse, Giso Grimm, Volker Hohmann
PMID 32270755WHAT IT FOUND
Head movement affects hearing aid noise reduction performance, but misalignment is the main cause, not algorithm maladaptation.
Directional algorithms lose up to 6 dB of benefit when the head is not pointed at the target speaker in realistic environments. Omnidirectional algorithms are barely affected.
Key findings
01Maladaptation (slow algorithm response to movement) was not a significant factor in realistic environments; performance loss was driven by head direction.
02Directional hearing aid algorithms showed a strong dependency on head direction, with performance dropping when the listener did not face the target speaker.
03The variation in algorithm benefit across different head movements reached up to 6 dB on average and 15 dB in single time windows.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The study used head movement data from normal-hearing listeners, not actual hearing aid users, so the movement patterns may differ in real-world clinical populations. The results are based on acoustic simulations and do not measure actual speech intelligibility or listening effort, only signal-to-noise ratio improvements. The environments, while realistic, were simulated in a laboratory setting and may not capture all complexities of daily life.
Declared interests
Funded by the Deutsche Forschungsgemeinschaft. No other conflicts declared.
The easy way to misread this
Do not assume that all hearing aid users will behave like the normal-hearing participants in this study. Patients with hearing loss may move their heads differently due to visual or balance issues, which could change the magnitude of the misalignment effect. Additionally, a 6 dB drop in signal-to-noise ratio does not automatically equate to a specific drop in understanding; this is a technical simulation, not a patient outcome study.