hyperacusis/atrophy

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Fine structure of degeneration in the cochlear nucleus of the chinchilla after acoustic overstimulation.

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To study plastic changes in the cochlear nucleus after acoustic stimulation, adult chinchillas were exposed once to a 4-kHz octave-band noise at 108 dB SPL for 3 hr. After survival times of 1, 2, 4, 8, and 16 weeks, samples were taken for electron microscopy from a part of the cochlear nucleus,

Adding insult to injury: cochlear nerve degeneration after "temporary" noise-induced hearing loss.

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Overexposure to intense sound can cause temporary or permanent hearing loss. Postexposure recovery of threshold sensitivity has been assumed to indicate reversal of damage to delicate mechano-sensory and neural structures of the inner ear and no persistent or delayed consequences for auditory

Advances in the neurobiology of hearing disorders: recent developments regarding the basis of tinnitus and hyperacusis.

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The prevalence of hearing problems in the Western world has, due to aging of the population, doubled over the past 30 years. Thereby, noise-induced hearing loss is an important factor that worsens over time in addition to age-related hearing loss. Hearing loss is usually measured as an elevation of

Is noise-induced cochlear neuropathy key to the generation of hyperacusis or tinnitus?

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Perceptual abnormalities such as hyperacusis and tinnitus often occur after acoustic overexposure. Although such exposure can also result in permanent threshold elevation, some individuals with noise-induced hyperacusis or tinnitus show clinically normal thresholds. Recent work in animals has shown

Central auditory plasticity after carboplatin-induced unilateral inner ear damage in the chinchilla: up-regulation of GAP-43 in the ventral cochlear nucleus.

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Inner ear damage may lead to structural changes in the central auditory system. In rat and chinchilla, cochlear ablation and noise trauma result in fiber growth and synaptogenesis in the ventral cochlear nucleus (VCN). In this study, we documented the relationship between carboplatin-induced hair

Single cochlear fibre responses in guinea pigs with long-term endolymphatic hydrops.

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Some cochlear fibre response properties have been measured in two GPs approximately one year after induction of endolymphatic hydrops (by surgical obliteration of the endolymphatic sac and duct). These animals are considered as models of the effects of hydrops in Menière's disease, and the purpose

[Clinical characteristics of early juvenile GM2 gangliosidosis: a case report].

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We describe the case of a 15-year-old male with early juvenile type GM2 gangliosidosis. He first manifested with progressive clumsiness in his extremities at the age of 1.5 years, followed by motor regression. Intellectual disability became evident as late as age 6 years. This discrepancy along with

GM1 gangliosidosis type 2 in two siblings.

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A sister and brother, now aged 7 and 9 years, presented with developmental arrest, gait disturbance, dementia, and a progressive myoclonic epilepsy syndrome with hyperacusis in the second year of life. Then, spastic quadriparesis led to a decerebrate state. In the absence of macular or retinal

Cochlear ablation effects on amino acid levels in the chinchilla cochlear nucleus.

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Inner ear damage can lead to hearing disorders, including tinnitus, hyperacusis, and hearing loss. We measured the effects of severe inner ear damage, produced by cochlear ablation, on the levels and distributions of amino acids in the first brain center of the auditory system, the cochlear nucleus.

Acoustic reflex and loudness discomfort in acute facial paralysis.

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An extensive research protocol was used to evaluate the conditions of 48 consecutive patients with acute facial paralysis. The results indicated that after nerve excitability testing, the acoustic reflex was the most efficient indicator of impending nerve degeneration and predictor of recovery. The

Neuropathological changes in auditory brainstem nuclei in cattle with experimentally induced bovine spongiform encephalopathy.

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Bovine spongiform encephalopathy (BSE) is characterized by the appearance of spongy lesions in the brain, particularly in the brainstem nuclei. This study evaluated the degenerative changes observed in the central auditory brainstem of BSE-challenged cattle. The neuropathological changes in the

Noise-induced hearing loss: Neuropathic pain via Ntrk1 signaling.

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Severe noise-induced damage to the inner ear leads to auditory nerve fiber degeneration thereby reducing the neural input to the cochlear nucleus (CN). Paradoxically, this leads to a significant increase in spontaneous activity in the CN which has been linked to tinnitus, hyperacusis and ear pain.

Investigating peripheral sources of speech-in-noise variability in listeners with normal audiograms.

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A current initiative in auditory neuroscience research is to better understand why some listeners struggle to perceive speech-in-noise (SIN) despite having normal hearing sensitivity. Various hypotheses regarding the physiologic bases of this disorder have been proposed. Notably, recent work has

Enhancement of the Medial Olivocochlear System Prevents Hidden Hearing Loss.

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Cochlear synaptopathy produced by exposure to noise levels that cause only transient auditory threshold elevations is a condition that affects many people and is believed to contribute to poor speech discrimination in noisy environments. These functional deficits in hearing, without changes in

Topiramate versus amitriptyline in migraine prevention: a 26-week, multicenter, randomized, double-blind, double-dummy, parallel-group noninferiority trial in adult migraineurs.

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OBJECTIVE The primary objective of this study was to compare the efficacy and tolerability of topiramate and amitriptyline in the prophylaxis of episodic migraine headache. METHODS This was a 26-week, multicenter, randomized, double-blind, double-dummy, parallel-group noninferiority study. Adults

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