A continuous exposure to intense noise for a longer duration may cause irreversible damage to the nerves and the inner ear resulting in loss sensitivity at higher frequencies which is called

A continuous exposure to intense noise for a longer duration may cause irreversible damage to the nerves and the inner ear resulting in loss sensitivity at higher frequencies which is called

Right Answer is:

Permanent threshold shift

SOLUTION

High noise levels, at least, lead to Temporary Threshold Shif (TTS) which are dependent on the preceding exposure and last for varying time periods. After repeated exposures to noises that initially cause only TTS, a worker may experience threshold changes that do not recover. This is called a noise-induced permanent threshold shift.

Permanent threshold shift results from prolonged exposure to loud noise and is irreversible due to the permanent reduction in nerve impulses to the brain. This shift is most marked at the 4000 Hz frequency, which can lead to difficulty in hearing certain consonants and some female voices. 

It is important to note that, if the level of noise exposure remains unchanged, noise-induced hearing loss will lead to a permanent threshold shift affecting an increasing number of frequencies. The hearing loss caused can be temporary or permanent.

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