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The Hum is a name often given to widespread reports of a persistent and invasive low-frequency humming, rumbling, or droning noise audible to many but not all people. Hums have been reported all over the world, including the United States, the United Kingdom, Australia and Canada.
The tympanic reflex helps prevent damage to the inner ear by muffling the transmission of low frequency vibrations from the tympanic membrane to the oval window. The reflex has a response time of 40 milliseconds, not fast enough to protect the ear from sudden loud noises such as an explosion or gunshot.
Noise-induced hearing loss, ear infections, disease of the heart or blood vessels, Ménière's disease, brain tumors, inner ear tumors, emotional stress, traumatic brain injury, excessive earwax [2] [4] Diagnostic method: Based on symptoms, audiogram, neurological exam [1] [3] Treatment: Counseling, sound generators, hearing aids [2] [5 ...
Cochlear hydrops preferentially affects the apex of the cochlea where low-frequency sounds are interpreted. Due to the fluid imbalance in this area, parts of the cochlea are stretched or under more tension than usual, which can lead to distortions of sound, changes in pitch perception, or hearing loss, all usually in the low frequencies.
The first component is the loss of audibility, which may be perceived as an overall decrease in volume. Modern hearing aids compensate this loss with amplification. The second component is known as "distortion" or "clarity loss" due to selective frequency loss. [8] Consonants, due to their higher frequency, are typically affected first. [7]
Hearing becomes gradually less sensitive as frequency decreases, so for humans to perceive infrasound, the sound pressure must be sufficiently high. Although the ear is the primary organ for sensing low sound, at higher intensities it is possible to feel infrasound vibrations in various parts of the body.
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Symptoms are believed to occur as the result of increased fluid buildup in the labyrinth of the inner ear. [3] Diagnosis is based on the symptoms and a hearing test. [3] Other conditions that may produce similar symptoms include vestibular migraine and transient ischemic attack. [1] No cure is known. [3]