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Electrically Evoked Stapedius Reflex Measurements in Cochlear Implantation and Its Application in the Postoperative Fitting Process
Published on: June 21, 2024
The use of interaural time and level difference cues by bilateral cochlear implant users
Justin M Aronoff1, Yang-Soo Yoon, Daniel J Freed
1Communication and Neuroscience Division, House Ear Institute, 2100 W 3rd St, Los Angeles, California 90057, USA. jaronoff@hei.org
The Journal of the Acoustical Society of America
|March 25, 2010
Summary
Bilateral cochlear implant (CI) users primarily use interaural level difference (ILD) cues for sound localization. However, some users also utilize interaural time difference (ITD) cues, indicating a complex interplay between these auditory signals.
Area of Science:
- Auditory Neuroscience
- Audiology
- Signal Processing
Background:
- Bilateral cochlear implant (CI) users' sound localization is thought to depend mainly on interaural level difference (ILD) cues.
- Evidence for the role of interaural time difference (ITD) cues in CI users is indirect.
Purpose of the Study:
- To directly measure the contribution of independent ITD and ILD cues to sound localization in bilateral CI users.
- To investigate the interaction between ITD and ILD cues in this population.
Main Methods:
- Utilized head-related transfer functions (HRTFs) to independently manipulate ITD and ILD.
- Directly assessed the impact of these manipulated cues on sound localization performance in bilateral CI users.
Main Results:
- Demonstrated a significant reliance on ILD cues for sound localization.
- Observed that a subset of bilateral CI users effectively utilized ITD cues.
- Identified a complex interaction between ITD and ILD cues influencing localization accuracy.
Conclusions:
- Bilateral CI users show a primary dependence on ILD cues for sound localization.
- ITD cues can also contribute to sound localization in some bilateral CI users.
- The interplay between ITD and ILD is crucial for understanding spatial hearing with bilateral CIs.
