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Wednesday, August 13, 2014

Loud noise can change how brain processes speech

New research says loud noises such as sirens of fire trucks or ambulances even loud noise of an mp3 player can damage the brain and ears. About 15 percent of Americans between the ages of 20-69 years of hearing loss due to exposure to loud noises. Scientists know that loud noises can damage the hair cells in the ear that receives the voices.
Patrick Kanold, a neuroscientist at the University of Maryland who was record neural activity in auditory cortex of adult rats, which is a part of the brain that produce the hearing. (Picture from: http://bit.ly/1tEELnC)
Regular exposure to sounds greater than 100 
decibelsfor more than a minute at a time may 
lead to permanent hearing loss, according to 
the National Institute of Deafness and Other 
Communication Disorders. (Picture from:  
Research recently said that hearing damage can also affect the brain's ability to process sounds into words and conversation. Scientists from the University of Texas at Dallas gives voice loud noises that cause mild and severe hearing damage in rats.

After that, scientists examine the parts of the brain that processes sound rat, which is called the auditory cortex. In mice that severely damaged his hearing is less than 1/3 cortex showed no reaction when the given stimuli. In the sections that showed the reaction, the reaction is slower.

Brains of mice that had mild hearing damage also change, responds more slowly and require more stimulation than normal mice hearing function.

This is important, because as it is delivered to the researchers in the journal Ear and Hearing, hearing is a complicated process. They said the sound heard only the first step of the process is very complicated nerve, which the brain uses to convert it into speech sounds that could be understood.

Scientists also indicate if the hair cells are damaged ears will not grow back and the damage can not be repaired. *** [EKA | FROM VARIOUS SOURCES | SCIENCEDAILY | VOA NEWS]
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