Hearing is not good, why are you afraid of loud?
We always think that people who are deaf, people who wear hearing aids can't hear it, and they need to be louder, and the bigger the better, it is not. Many deaf people 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 sets the sounds of several different frequencies that normal young people can just hear as 0dBHL (hearing zero). The sound of 0dBHL is normal. can hear. The conversation in a quiet environment is about 65dBHL, which sounds soft and appropriate. If we shout in the ear, we will all be disgusted, and we will feel the greater voice. In general, our tolerance limit will not exceed 120dBHL.
From the OdBHL that can be heard, the maximum limit of 120dB is the range we can hear. The term is called “audio dynamic range”. If there is hearing loss (deafness), the sound that can just be heard will not be OdBHL, but may be 30dB, 60dB, 70dBHL or even more. Suppose a deaf person's average hearing loss (PTA) is 6OdBHL (which means that 60dBHL is the sound he just can hear, it feels like a normal listening valve: OdBHL), and assuming he also has a 12OdB auditory dynamic range, then The monks seem to be able to tolerate the sound around 180dBHL. In fact, not only can no one endure, there is no such huge sound in nature. The second assumption is completely wrong.
Despite being whispered, most of the deaf people, especially those with sensorineural hearing loss, are no better or worse than normal hearing. Not to mention 120dB, which is 110dB, 100dB, they often hear "deafening." This is because their range has narrowed to varying degrees, sometimes even narrower to less than 5dB. In other words, the reduction of 5dB can not be heard, and the increase of 5dB can not stand. 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). Revitalization is a pathological reaction accompanied by hearing loss. Experts define it as: "As the sound intensity increases, the loudness feels abnormally faster than normal people." The essence of re-vibration is the inner and outer hair cells of the inner ear. Collaboration is out of tune. When explaining the rejuvenation phenomenon to patients, we can make the following analogy: the voice of the speech is doubled, and the normal person's listening feeling is doubled: the voice of the speech is increased tenfold, one hundred times, the normal person's The listening feeling will increase ten times and one hundred times. This is not the case with revived monks. The voice of our speech has doubled, and their listening feelings tend to increase tenfold, twentyfold or even fiftyfold and one hundredfold. Excessive growth in the sense of hearing (loudness) is called revitalization.
The existence of revitalization is the root cause of deafness and fear of noisy. Revitalization is a common phenomenon, but it has not been known by deaf people and even most otologists. Therefore, once our patients are found to be “allergic” to large sounds, they should be introduced to them. The advantage of doing this is that we are often subject to unexpected trust. In addition, the hearing aids selected for patients with re-vibration must pay attention to the maximum sound output.
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