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Divergent Auditory Nerve Encoding Deficits Between Two Common Etiologies of Sensorineural Hearing Loss
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Modeling the Effect of Olivocochlear Efferents on the Subcortical Envelope Following Response in Humans
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Optimal Combination of Neural Temporal Envelope and Fine Structure Cues to Explain Speech Identification in Background Noise
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Modeling the Time-Varying and Level-Dependent Effects of the Medial Olivocochlear Reflex in Auditory Nerve Responses
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Sensorineural hearing loss amplifies neural coding of envelope information in the central auditory system of chinchillas
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Effects of sensorineural hearing loss on temporal coding of narrowband and broadband signals in the auditory periphery
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Abstract:
People with sensorineural hearing loss have substantial difficulty understanding speech under degraded listening conditions. Behavioral studies suggest that this difficulty may be caused by changes in auditory processing of the rapidly-varying temporal fine structure (TFS) of acoustic signals. In this paper, we review the presently known effects of sensorineural hearing loss on processing of TFS and slower envelope modulations in the peripheral auditory system of mammals. Cochlear damage has relatively subtle effects on phase locking by auditory-nerve fibers to the temporal structure of narrowband signals under quiet conditions. In background noise, however, sensorineural loss does substantially reduce phase locking to the TFS of pure-tone stimuli. For auditory processing of broadband stimuli, sensorineural hearing loss has been shown to severely alter the neural representation of temporal information along the tonotopic axis of the cochlea. Notably, auditory-nerve fibers innervating the high-frequency part of the cochlea grow increasingly responsive to low-frequency TFS information and less responsive to temporal information near their characteristic frequency (CF). Cochlear damage also increases the correlation of the response to TFS across fibers of varying CF, decreases the traveling-wave delay between TFS responses of fibers with different CFs, and can increase the range of temporal modulation frequencies encoded in the periphery for broadband sounds. Weaker neural coding of temporal structure in background noise and degraded coding of broadband signals along the tonotopic axis of the cochlea are expected to contribute considerably to speech perception problems in people with sensorineural hearing loss.
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Keyword:
Article
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URL: https://doi.org/10.1016/j.heares.2013.01.014
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3688697
http://www.ncbi.nlm.nih.gov/pubmed/23376018
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The use of confusion patterns to evaluate the neural basis for concurrent vowel identificationa
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Psychophysiological analyses demonstrate the importance of neural envelope coding for speech perception in noise
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Psychophysiological Analyses Demonstrate the Importance of Neural Envelope Coding for Speech Perception in Noise
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In: SFN (2011)
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Predicted effects of sensorineural hearing loss on across-fiber envelope coding in the auditory nervea
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Temporal coding in auditory-nerve fibers following noise-induced hearing loss
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In: Theses and Dissertations Available from ProQuest (2011)
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The role of envelope and temporal fine structure in the perception of noise degraded speech
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In: Theses and Dissertations Available from ProQuest (2010)
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