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Hearing, auditory perception, or audition is the ability to perceive sound by detecting vibrations changes in the pressure of the surrounding medium through time, through an organ such as the ear. Hearing is critical for normal development and acquisition of language and Speech. Hearing impairment exists when there is diminished sensitivity to the sounds normally heard. According to Smith, the term hearing impairment is usually reserved for people who have relative insensitivity to sound in the speech frequencies. The severity of a hearing impairment is categorized according to the increase in volume above the usual level necessary before the listener can detect it. Along the world approximately one child in 1,000 is hearing impaired from birth, and the number rises to about 1.6 per 1,000 in adolescents. The causes are hereditary in 30-39%, acquired in 19-30% and the cause remains unknown in 31-48% of children. Language plays a central role in development.
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