Bimodal Cochlear Implants: Measurement of the Localization Performance as a Function of Device Latency Difference

Area of Science:

• Audiology
• Neuroscience
• Biomedical Engineering

Background:

• Bimodal cochlear implant (CI) users often exhibit impaired sound localization.
• Processing latency differences between hearing aids and CIs contribute to this deficit.
• Previous latency adjustments improved localization but were not fully optimized.

Purpose of the Study:

• To determine the optimal cochlear implant latency for improving sound localization in bimodal users.
• To investigate if frequency-independent latency adjustments are sufficient.

Main Methods:

• Eleven bimodal CI users participated in the study.
• Sound localization performance was measured across various CI latencies.
• Interaural latency adjustments were applied.

Main Results:

• Adjusting interaural latency improved localization for most participants.
• The optimal CI latency was often shorter than predicted for intermediate frequencies.
• Nine out of eleven subjects preferred a shorter CI latency.

Conclusions:

• Individualized CI latency adjustments are crucial for optimal sound localization in bimodal users.
• Current frequency-independent compensation methods may not be sufficient.
• Further research into personalized latency tuning is warranted.