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Hyperacusis is an increased sensitivity to sound and a low tolerance for environmental noise. Definitions of hyperacusis can vary significantly; it often revolves around damage to or dysfunction of the stapes bone, stapedius muscle or tensor tympani ().
Certain sounds, such as fingernails drawn down a blackboard, cause strong feelings of aversion or even fear in most humans. A 2004 study claimed that the blackboard sound was very similar to the warning cry of Siamang gibbons and hypothesized that a vestigial reflex is what causes the fight or flight reaction in humans. [ 3 ]
The ear's shape also allows the sound to be heard more accurately. Many breeds often have upright and curved ears, which direct and amplify sounds. As dogs hear higher frequency sounds than humans, they have a different acoustic perception of the world. [24] Sounds that seem loud to humans often emit high-frequency tones that can scare away dogs.
Psychoacoustic analysis reveals that sound pressure level is a less than ideal predictor of human reception of noise, so efforts have been made since the 1960s [6] [7] to apply loudness metrics instead, which can incorporate other factors such as spectral and temporal auditory masking and level-dependent frequency weighting to more accurately ...
Image credits: anon #6. Being born with only one ear and a few other issues with my face. Potential diagnosis of mild Goldenhar's. I thought it was the best thing ever and totally normal until I ...
It is approximately the quietest sound a young human with undamaged hearing can detect at 1 kHz. [4] The threshold of hearing is frequency-dependent and it has been shown that the ear's sensitivity is best at frequencies between 2 kHz and 5 kHz, [5] where the threshold reaches as low as −9 dB SPL. [6] [7] [8]
The most quiet sounds that people with mild hearing loss can hear with their better ear are between 25 and 40 dB HL. Moderate hearing loss - People with moderate hearing loss have difficulty keeping up with conversations when they are not using a hearing aid. On average, the most quiet sounds heard by people with moderate hearing loss with ...
Sometimes, people need to find a place to vent, so they go online to share photos of the things that their wives and girlfriends do that are irritating yet also endearing.