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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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Abstract:
The medial olivocochlear reflex (MOCR), a feedback mechanism that controls gain of the outer hair cells, is thought to provide protection and enhancement for a listener in background noise. This listening advantage can be attributed to a suppression of auditory nerve firing, which results in an increased dynamic range for encoding a signal of interest (e.g. a tone or speech). The computational model presented here updates the work of Smalt et al. (2014), which added some of the dynamic characteristics of the MOCR with the more recent humanized version (Zilany, et al., 2014). This effect of the model is to effectively reduce the outer hair cell gain, depending on the stimulus frequency, level, and timing. Human Envelope Following Responses (EFRs) were compared to Nelson and Carney (2004) Inferior Colliculus (IC) model output used in conjunction with the MOCR auditory nerve model. Adding simultaneous contralateral noise did not significantly affect the model IC modulation filter energy at the stimulus frequency, while a 500 ms contralateral noise precursor increased the output by approximately 3 dB, consistent with observations in humans (Bharadwaj, 2015). Further study of the auditory nerve model with the MOCR may help to understand human susceptibility to noise-induced hearing loss, damage to low-spontaneous rate auditory nerve fibers, as well as develop new algorithms for hearing aids that are able to restore normal speech perception in noise.
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Keyword:
Anatomy and Physiology; auditory nerve; hearing disorders; hearing loss; medial olivocochlear reflex (MOCR); Medicine and Medical Research; perception
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URL: http://www.dtic.mil/docs/citations/AD1033505
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD1033505
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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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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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