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Spectrotemporal Modulation Sensitivity in Cochlear-Implant and Normal-Hearing Listeners: Is the Performance Driven by
Ning Zhou1, Susannah Dixon1, Zhen Zhu2
1Department of Communication Sciences and Disorders, East Carolina University, Greenville, North Carolina, United States.
Trends in Hearing
|September 8, 2020
Summary
Temporal processing, specifically amplitude modulation (AM) sensitivity, is crucial for spectrotemporal modulation discrimination in both cochlear implant (CI) users and normal hearing listeners. This temporal sensitivity significantly impacts speech recognition in noise for CI users.
Area of Science:
- Auditory Neuroscience
- Speech Perception
- Signal Processing
Background:
- Auditory perception relies on processing temporal and spectral information.
- Cochlear implants (CI) aim to restore hearing by providing electrical stimulation.
- Understanding how temporal and spectral modulations are processed is key to improving CI technology.
Purpose of the Study:
- To investigate the relative contributions of temporal and spectral modulation sensitivity to spectrotemporal modulation discrimination.
- To compare spectrotemporal modulation processing with amplitude modulation (AM) detection and static spectral ripple discrimination.
- To examine the relationship between spectrotemporal modulation thresholds, AM sensitivity, and speech recognition in noise for CI users.
Main Methods:
- Participants (CI users and normal hearing) discriminated spectrotemporally modulated stimuli with varying ripple densities.
- Stimuli featured spectral ripples shifting across frequency at 5 Hz, with decreasing AM depth at higher ripple densities.
- Performance was assessed via spectrotemporal modulation thresholds, AM detection, and static spectral ripple discrimination.
Main Results:
- Spectrotemporal modulation thresholds were more strongly correlated with AM detection than static spectral ripple discrimination for both groups.
- For CI users, spectrotemporal modulation thresholds correlated with speech recognition in noise, driven by AM sensitivity.
- Temporal information processing appeared to be a more significant factor than spectral processing for the tested modulation rates.
Conclusions:
- Temporal modulation sensitivity, particularly AM detection, plays a dominant role in spectrotemporal modulation discrimination.
- AM sensitivity is a key factor linking spectrotemporal processing to speech recognition in noise for CI users.
- Auditory processing limitations at these modulation rates may stem more from temporal than spectral processing deficits.
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