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Middle ear muscle abnormalities have been identified as causing ear-related disorders such as tinnitus, hyperacusis, ear fullness, dizziness, and/or otalgia. Due to the suspected involvement of the tensor tympani muscle, this group of signs has been dubbed the Tonic Tensor Tympani Syndrome. However, the elusive mechanisms of TTTS are still elusive, with the suggested correlation between MEM dysfunction and the symptoms yet to be established. Both admittance measurement and/or measurement of air pressure in the sealed external auditory canal has been investigated into the middle ear of 11 patients who reported TTTS symptoms. Although the former technique measured middle ear elasticity, the latter gives an estimate of the tympanic membrane displacement. On the other hand, acute TTM contraction in any patient could not be detected.
Source link: https://doi.org/10.1016/j.heares.2022.108519
Loudness recruitment is a common symptom of hearing loss exacerbated by cochlear lesions, which is described as an abnormally rapid rise in loudness perceptions of sound intensity. Damage to the outer hair cells alters the basilar membrane's nonlinear structure, resulting in aberrant auditory nerve responses related to loudness recruitment. Hyperacusis can also be accompanied by an aversion to sound and a fear of sound stimuli, in which the limbic system can play a vital role. This brief review aims to present the current status of the neurobiological pathways that distinguish between loudness recruitment and hyperacusis.
Source link: https://doi.org/10.12659/MSM.936373
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