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Why are the ears deaf?

We always think that people who are deaf are whispering, and it is better to have a louder voice, and the bigger the better. actually not. Many monks are afraid of noisy and even very afraid of noisy.

Our hearing is limited. Just like setting the temperature of water to 0 degrees Celsius, the audiologist artificially defines the sounds of several different frequencies that normal young people can hear as 0dBHL (0dBHL). Hearing 0-sized sounds are barely audible. The conversation in a quiet environment is about 60 listening level, which sounds soft and appropriate. If we shout in the ear, we will all be disgusted because the sound is too loud. We can’t stand the bigger sound. In general, our tolerance limits will not exceed the 140 listening level.

From the 0 hearing level that we can just hear, to the maximum limit 140 listening level is the range we can listen to, the term is called “audio dynamic range”. If there is hearing loss (deafness), the sound that you just hear will not be 0 hearing level, but may be 30, 60, 70 listening level or even more. Suppose a deaf person’s average hearing loss (PTA) 60 listening level (which means that the 60 listening level is the sound he just heard, which is equivalent to our 0 listening level) and assumes that he also has an 140 hearing level of auditory dynamic range. Then the monk seems to be able to endure the sound of 200 hearing level. In fact, not only can no one endure the 200 listening level, so the big sound does not exist in nature. The second assumption is completely wrong.

Despite the whispering, most of the deaf people, especially those with neurological deafness, are no better or worse than normal hearing. Not to mention 140, 130, 120, 110 listening level, they often hear “deafening.” This is because their hearing dynamic range is narrowed to varying degrees, sometimes even narrower than 5 decibels, that is, reducing 5 decibels can’t be heard, and increasing 5 decibels can’t stand it. Therefore, many deaf people are more afraid of noise than normal hearing people.

Be afraid of noisy after deafness, the term is called “re-vibration” (reverberation) phenomenon. Revitalization is a pathological change accompanied by hearing loss, which is the result of the disorder of the inner and outer hair cells in the inner ear. How to understand the phenomenon of re-vibration? We can regard it as “allergic” under certain conditions. Simply put: the voice of the speech is increased by 1 times, and the normal person’s listening feeling is also increased by 1 times; the sound is increased by 10 times and 100 times, and the normal hearing person will increase 10 times and 100 times accordingly. This is not the case with revived monks. The voice of the speech is increased by 1 times, and their listening feeling will increase 10 times, 20 times or even 50 times. Excessive growth in the sense of hearing (loudness) led to the resurgence of the phenomenon. Because of this, deaf patients with rejuvenation problems are particularly afraid of noisy.

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