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Temporal processing and speech perception in noise by listeners with auditory neuropathy.

Vijaya Kumar Narne¹

¹All India Institute of Speech and Hearing, Mysore, India. vijaynarne@gmail.com

|February 15, 2013

Summary

Listeners with Auditory Neuropathy (AN) show impaired temporal processing, significantly impacting their ability to perceive speech in noisy environments. This difficulty stems from challenges in extracting crucial speech signal cues.

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Area of Science:

Neuroscience
Audiology
Speech Science

Background:

Auditory Neuropathy (AN) is a complex hearing disorder.
Individuals with AN experience difficulties understanding speech, particularly in noisy settings.
Temporal processing is crucial for speech perception.

Purpose of the Study:

To investigate the relationship between temporal processing abilities and speech perception in noise for individuals with Auditory Neuropathy (AN).
To compare temporal processing and speech perception in noise between listeners with AN and those with normal hearing.

Main Methods:

Two experiments were conducted.
Temporal resolution was assessed using temporal modulation transfer function and frequency modulation detection.
Speech perception in quiet and noise was evaluated at various signal-to-noise ratios (SNRs).

Main Results:

Listeners with AN demonstrated significantly poorer performance in temporal modulation and frequency modulation detection compared to normal-hearing listeners.
Impaired ability to extract envelope and fine structure cues was observed in individuals with AN.
A significant correlation was found between temporal resolution measures and speech perception in noise.

Conclusions:

Impaired temporal processing, specifically in extracting envelope and fine structure cues, likely contributes to the significant speech-in-noise challenges faced by individuals with Auditory Neuropathy (AN).
These findings highlight the importance of temporal processing for auditory rehabilitation in AN.