Traumatic noise is sounds with intensities over 105 dB(A) for one hour. 
It is well recognized to produce significant levels of permanent hearing loss. 

Example:  firearm noise (>130dB (A) for few seconds)



Traumatic Noise Levels

Threatening noise is sounds range between 90dB(A)-105dB(A), with exposure times of 2 hours or more. Often cause temporary hearing loss.

Example: Concerts, or night clubs

Threatening Noise Levels

Noise levels below 80 dB(A). It have been considered harmless for the auditory system for any exposure duration. However, recent research shows how these non traumatic noise could cause damage.

'Safe' Noise Levels

Excessive noise exposure could produce permanent damage to the auditory system. Depending on the noise levels you are exposed to, there could be different long-term outcomes individuals could experience. 
Exposure is typically categorized into three classes:
- Traumatic Noise Levels
- Threatening Noise Levels
- Safe Noise Levels




State University of New York at Buffalo

Studying hearing imparments and auditory disorders is useful to learn the function of each aspect of the auditory cortex and pathways

Hearing Impairments / Auditory Disorders

The inability to accurately discern tunes. People with congenital amusia never develop the baility to understand the basical musical erlationships with pitch. timing does not seem to be affected in amusia. the right inferior frontal gyrus tends to have less white matter in people with amusia. diffusion tensor imaging also found fewer connections between the frontal cortex and emporal auditory cortex.

Amusia

Childhood exposure to variations of acoustic stimuli has an impact on individuals experiencing abnormal acoustic experiences, such as tinnitus, hyperacusis, and hidden hearing loss in their adulthood. However, there are poor understanding of these ideas. 


Impact of abnormal acoustic activity early in life 

Exposure on levels of noise causing hearing loss  

Hearing loss and deafness can occur at any stage of life and may result from various factors. Due to the mechanical nature of sound transmission through the ear, some degree of hearing loss is considered inevitable over a lifetime. Generally, hearing loss is categorized by issues in one of three areas: the failure of sound vibrations to reach the cochlea, problems with the cochlea's conversion of sound to action potentials, or dysfunction within the brain's auditory processing systems.

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