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Updated: Mar 25, 2026

Electrically Evoked Stapedius Reflex Measurements in Cochlear Implantation and Its Application in the Postoperative Fitting Process
Published on: June 21, 2024
Can place-specific cochlear dispersion be represented by auditory steady-state responses?
Andreu Paredes Gallardo1, Bastian Epp1, Torsten Dau1
1Hearing Systems Group, Department of Electrical Engineering, Technical University of Denmark, Ørsteds Plads Building 352, 2800 Kongens Lyngby, Denmark.
Auditory steady-state responses (ASSR) do not appear sensitive enough to objectively assess local cochlear dispersion. The study found that ASSRs are dominated by across-channel synchrony, not local place-specific information.
Area of Science:
- Auditory Neuroscience
- Signal Processing in Hearing
Background:
- Cochlear dispersion describes how different sound frequencies spread along the cochlea.
- Auditory steady-state responses (ASSR) are objective measures of auditory function.
- Assessing local cochlear dispersion objectively remains a challenge.
Purpose of the Study:
- To investigate the extent to which auditory steady-state responses (ASSR) can objectively assess local cochlear dispersion.
- To test the hypothesis that specific stimuli can elicit maximal basilar membrane (BM) responses reflecting local cochlear properties.
Main Methods:
- Utilized harmonic tone complexes (Schroeder-based phase) and auditory-filter impulse responses (IR) as stimuli.
- Compared ASSR amplitudes generated by these stimuli and their temporally reversed counterparts.
- Investigated stimulus-driven synchrony ('within-channel' vs. 'across-channel') in the auditory system.
Main Results:
- ASSRs evoked by Schroeder tone complexes were dominated by 'across-channel' synchrony, failing to provide local cochlear information.
- No significant differences in ASSR were observed between auditory-filter impulse responses and their reversed versions.
- The study suggests ASSR is not sensitive enough for local cochlear dispersion assessment.
Conclusions:
- Auditory steady-state responses (ASSR) are not suitable for objectively measuring local cochlear dispersion.
- While ASSRs reflect overall hearing sensitivity, they lack the specificity for detailed cochlear mechanics.
- Further research may be needed to develop more precise objective measures of cochlear dispersion.
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