Psychophysical and Physiological Assessment of the Representation of High-frequency Spectral Notches in the Auditory Nerve

2007 ◽  
pp. 51-59 ◽  
Author(s):  
Enrique A. Lopez-Poveda ◽  
Ana Alves-Pinto ◽  
Alan R. Palmer
Keyword(s):  
Auditory Nerve ◽  
High Frequency ◽  
Physiological Assessment

Psychophysical and physiological assessment of the representation of high‐frequency spectral notches in the auditory nerve

2006 ◽  
Vol 119 (5) ◽  
pp. 3235-3235
Author(s):  
Ana Alves‐Pinto ◽  
Alan R. Palmer ◽  
Enrique A. Lopez‐Poveda
Keyword(s):  
Auditory Nerve ◽  
High Frequency ◽  
Physiological Assessment

Late Waves in the Response Recorded from the Intracranial Portion of the Auditory Nerve in Humans

1993 ◽  
Vol 102 (12) ◽  
pp. 945-953 ◽  
Author(s):  
Aage R. Møller
Keyword(s):  
Auditory Nerve ◽  
High Frequency ◽  
Basilar Membrane ◽  
Opposite Polarity ◽  
Surgical Trauma ◽  
Moderate Degree ◽  
Speech Discrimination ◽  
Eighth Nerve ◽  
Pure Tone Threshold ◽  
Click Polarity

We showed in previous studies that the click-evoked responses from the exposed eighth nerve in some patients contain quasiperiodic components that appear in the interval between 4 and 16 milliseconds after the click stimulus, and that the phase of these oscillatory components reverses when the click polarity is reversed. When the responses to clicks of opposite polarity are subtracted from each other, these late waves appear as a prolonged quasiperiodic oscillation with a frequency around 700 Hz. These late components appear more frequently in patients with high-frequency hearing losses than in patients with normal hearing. We have attributed these components to prolonged and in-phase oscillations of a large portion of the basilar membrane, possibly caused by the generation of standing waves on the basilar membrane. The results of the present study show that these oscillations correspond closely in both frequency and phase to the late oscillations that are seen in the cross-correlograms of the responses from the exposed eighth nerve to pseudorandom noise. The finding that similar quasiperiodic components can be retrieved from the responses from the exposed eighth nerve to both transient and continuous sounds is taken as an indication that the neural activity that these components represent reflects some general property of the cochlear frequency analyzer. We also found that the speech discrimination is not noticeably different in patients with such waves compared with what it is in patients with similar hearing loss who do not have such waves. This is taken as an indication that spectral analysis in the cochlea is less important in speech discrimination than previously assumed. The importance of timing of auditory nerve activity for speech perception is indicated by the finding that surgical trauma of the intracranial portion of the auditory nerve that only causes a moderate degree of deterioration of the pure tone threshold reduces speech discrimination scores to zero.

scholarly journals Synaptic Transmission at the Cochlear Nucleus Endbulb Synapse During Age-Related Hearing Loss in Mice

2005 ◽  
Vol 94 (3) ◽  
pp. 1814-1824 ◽  
Author(s):  
Yong Wang ◽  
Paul B. Manis
Keyword(s):  
Hearing Loss ◽  
Synaptic Transmission ◽  
Cochlear Nucleus ◽  
Auditory Nerve ◽  
High Frequency ◽  
Nerve Activity ◽  
Synaptic Release ◽  
Endbulb Of Held ◽  
Age Related ◽  
Age Related Hearing Loss

Age-related hearing loss (AHL) typically starts from high-frequency regions of the cochlea and over time invades lower-frequency regions. During this progressive hearing loss, sound-evoked activity in spiral ganglion cells is reduced. DBA mice have an early onset of AHL. In this study, we examined synaptic transmission at the endbulb of Held synapse between auditory nerve fibers and bushy cells in the anterior ventral cochlear nucleus (AVCN). Synaptic transmission in hearing-impaired high-frequency areas of the AVCN was altered in old DBA mice. The spontaneous miniature excitatory postsynaptic current (mEPSC) frequency was substantially reduced (about 60%), and mEPSCs were significantly slower (about 115%) and smaller (about 70%) in high-frequency regions of old (average age 45 days) DBA mice compared with tonotopically matched regions of young (average age 22 days) DBA mice. Moreover, synaptic release probability was about 30% higher in high-frequency regions of young DBA than that in old DBA mice. Auditory nerve–evoked EPSCs showed less rectification in old DBA mice, suggesting recruitment of GluR2 subunits into the AMPA receptor complex. No similar age-related changes in synaptic release or EPSCs were found in age-matched, normal hearing young and old CBA mice. Taken together, our results suggest that auditory nerve activity plays a critical role in maintaining normal synaptic function at the endbulb of Held synapse after the onset of hearing. Auditory nerve activity regulates both presynaptic (release probability) and postsynaptic (receptor composition and kinetics) function at the endbulb synapse after the onset of hearing.

scholarly journals Spatiotemporal Developmental Upregulation of Prestin Correlates With the Severity and Location of Cyclodextrin-Induced Outer Hair Cell Loss and Hearing Loss

2021 ◽  
Vol 9 ◽  
Author(s):  
Dalian Ding ◽  
Haiyan Jiang ◽  
Senthilvelan Manohar ◽  
Xiaopeng Liu ◽  
Li Li ◽  
...  
Keyword(s):  
Hearing Loss ◽  
Hair Cells ◽  
Auditory Nerve ◽  
High Frequency ◽  
Spiral Ganglion ◽  
Low Frequency ◽  
Nerve Fibers ◽  
Spiral Ganglion Neurons ◽  
Auditory Nerve Fibers ◽  
Ganglion Neurons

2-Hyroxypropyl-beta-cyclodextrin (HPβCD) is being used to treat Niemann-Pick C1, a fatal neurodegenerative disease caused by abnormal cholesterol metabolism. HPβCD slows disease progression, but unfortunately causes severe, rapid onset hearing loss by destroying the outer hair cells (OHC). HPβCD-induced damage is believed to be related to the expression of prestin in OHCs. Because prestin is postnatally upregulated from the cochlear base toward the apex, we hypothesized that HPβCD ototoxicity would spread from the high-frequency base toward the low-frequency apex of the cochlea. Consistent with this hypothesis, cochlear hearing impairments and OHC loss rapidly spread from the high-frequency base toward the low-frequency apex of the cochlea when HPβCD administration shifted from postnatal day 3 (P3) to P28. HPβCD-induced histopathologies were initially confined to the OHCs, but between 4- and 6-weeks post-treatment, there was an unexpected, rapid and massive expansion of the lesion to include most inner hair cells (IHC), pillar cells (PC), peripheral auditory nerve fibers, and spiral ganglion neurons at location where OHCs were missing. The magnitude and spatial extent of HPβCD-induced OHC death was tightly correlated with the postnatal day when HPβCD was administered which coincided with the spatiotemporal upregulation of prestin in OHCs. A second, massive wave of degeneration involving IHCs, PC, auditory nerve fibers and spiral ganglion neurons abruptly emerged 4–6 weeks post-HPβCD treatment. This secondary wave of degeneration combined with the initial OHC loss results in a profound, irreversible hearing loss.

Effects of electrical stimulation on the acoustically evoked auditory-nerve response in guinea pigs with a high-frequency hearing loss

2011 ◽  
Vol 272 (1-2) ◽  
pp. 95-107 ◽  
Author(s):  
H. Christiaan Stronks ◽  
Huib Versnel ◽  
Vera F. Prijs ◽  
Wilko Grolman ◽  
Sjaak F.L. Klis
Keyword(s):  
Hearing Loss ◽  
Electrical Stimulation ◽  
Auditory Nerve ◽  
High Frequency ◽  
Guinea Pigs ◽  
High Frequency Hearing Loss ◽  
Nerve Response

scholarly journals Desynchronization of electrically evoked auditory-nerve activity by high-frequency pulse trains of long duration

2003 ◽  
Vol 114 (4) ◽  
pp. 2066-2078 ◽  
Author(s):  
Leonid M. Litvak ◽  
Zachary M. Smith ◽  
Bertrand Delgutte ◽  
Donald K. Eddington
Keyword(s):  
Auditory Nerve ◽  
High Frequency ◽  
Nerve Activity ◽  
Pulse Trains ◽  
Long Duration ◽  
Frequency Pulse

scholarly journals An experimental study into the acousto-mechanical effects of invading the cochlea

2006 ◽  
Vol 3 (9) ◽  
pp. 561-571 ◽  
Author(s):  
Wei Dong ◽  
Nigel P Cooper
Keyword(s):  
Auditory Nerve ◽  
High Frequency ◽  
Transfer Functions ◽  
Low Frequency ◽  
Mechanical Processing ◽  
Nerve Fibres ◽  
Nonlinear Mechanical ◽  
Optically Transparent ◽  
Mechanical Tuning ◽  
Laser Interferometric

The active and nonlinear mechanical processing of sound that takes place in the mammalian cochlea is fundamental to our sense of hearing. We have investigated the effects of opening the cochlea in order to make experimental observations of this processing. Using an optically transparent window that permits laser interferometric access to the apical turn of the guinea-pig cochlea, we show that the acousto-mechanical transfer functions of the sealed (i.e. near intact) cochlea are considerably simpler than those of the unsealed cochlea. Comparison of our results with those of others suggests that most previous investigations of apical cochlear mechanics have been made under unsealed conditions, and are therefore likely to have misrepresented the filtering of low-frequency sounds in the cochlea. The mechanical filtering that is apparent in the apical turns of sealed cochleae also differs from the filtering seen in individual auditory nerve fibres with similar characteristic frequencies. As previous studies have shown the neural and mechanical tuning of the basal cochlea to be almost identical, we conclude that the strategies used to process low frequency sounds in the apical turns of the cochlea might differ fundamentally from those used to process high frequency sounds in the basal turns.

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