Physiology of cochlear efferent and afferent neurons: Direct comparisons in the same animal
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Noise-induced cochlear synaptopathy: Past findings and future studies
2017, Hearing ResearchThe middle ear muscle reflex in the diagnosis of cochlear neuropathy
2016, Hearing ResearchCitation Excerpt :Despite the nearly complete threshold recovery, suprathreshold ABR wave-I amplitudes were decreased by 40–50% at 32 and 45 kHz (Fig. 1C), while suprathreshold DPOAE amplitudes recovered to control values at all but the highest frequency (Fig. 1F). In hopes of producing a more completely reversible threshold elevation, even at the highest test frequencies, we exposed a second group of mice at 16 wks of age, when they are slightly less vulnerable (Kujawa and Liberman, 2006). 24 hr following exposure, ABR and DPOAE thresholds were elevated by > 40 dB at 32 kHz (Fig. 1B,E).
Endogenous dynorphins, glutamate and N-methyl-d-aspartate (NMDA) receptors may participate in a stress-mediated Type-I auditory neural exacerbation of tinnitus
2013, Brain ResearchCitation Excerpt :Indeed, a significant amount of dendritic swelling does occur in the Type-I neurons that retain postsynaptic NMDA receptors, and many of these dendrites are those that are located on the medial or modiolar sides of the IHCs (Jäger et al., 2000; Pujol et al., 1993; Yamasoba et al., 2005). Recall (Section 6 above) that these basal-lateral modiolar (or medial-most) Type-I auditory neurons (dendrites) not only bear a preponderance of NMDA receptors (Pujol et al., 1992, 1993), but that they also receive from 2 to 3 times greater the number of LEOC axon terminals relative to the numbers of LEOC terminations found on the pillar-oriented Type-I neurons (Liberman, 1988, 1990; Merchan-Perez and Liberman, 1996). Such evidence, once again indicates that the dynorphin-containing LEOC system exerts significant modulatory control over those Type-I auditory dendrites that are characterized by the presence of glutamate-sensitive NMDA receptors, and that these Type-I auditory dendritic NMDA receptors have been largely implicated in mediating stress-induced glutamate neurotoxicity (Jäger et al., 2000; Pujol et al., 1992; Yamasoba et al., 2005).
Evidence of cochlear neural degeneration in normal-hearing subjects with tinnitus
2023, Scientific Reports