Hearing is how we perceive sound through vibrations and changes in pressure. It is a large part of the human sensory experience, but people who are hard of hearing or deaf typically rely on their other senses to get a greater understanding of what's happening in their surroundings. Hearing is part of a defense mechanism which causes us to react strongly in the presence of a loud sound. You may know this as covering or blocking your ears if there is a loud noise. When this happens, you are not really protecting your ears from the noise but from the intense vibrations which can do damage to the ear itself.
Hearing loss and auditory processing disorders can help us understand better the role hearing plays in human perception and response. Being able to pick up on distinct sounds helps us keep track of movement in our surroundings and anticipate coming actions and how we might respond appropriately.
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