Effect of multi-electrode configuration on sensitivity to interaural timing differences in bilateral cochlear-implant...

Area of Science:

• Auditory Neuroscience
• Biomedical Engineering
• Neuroscience

Background:

• Interaural timing difference (ITD) sensitivity in bilateral cochlear implant (CI) users varies with stimulation site.
• Understanding ITD sensitivity during multi-electrode stimulation is crucial for complex sound representation in CIs.

Purpose of the Study:

• To investigate how multi-electrode stimulation configurations affect ITD just noticeable differences (JNDs) in CI users.
• To determine optimal electrode stimulation strategies for ITD perception in CIs.

Main Methods:

• Measured ITD JNDs across various multi-electrode stimulation configurations in bilateral CI users.
• Compared multi-electrode ITD JNDs to single-electrode ITD JNDs.

Main Results:

• Multi-electrode ITD JNDs were generally poorer than the best single-electrode ITD JNDs.
• Stimulation along the entire cochlear array yielded better ITD sensitivity than stimulation at the array ends.
• Poorer ITD sensitivity was observed when stimulation was restricted to the array ends.

Conclusions:

• Multi-electrode stimulation strategies impact ITD sensitivity in CI users.
• Distributing ITD information across a wider cochlear region may enhance auditory perception.
• Optimizing electrode selection is key for maximizing ITD sensitivity in complex sound processing with CIs.