SLHS 1150 Lecture Notes - Lecture 25: Prelingual Deafness, Cochlear Implant, Deaf Culture
4 Dec 2018
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Define basic terminology and degrees of hearing loss. Hearing impairment: means any degree and type of auditory disorder. Deafness: means an extreme inability to discriminate conversation speech through the ear. Conductive impairments: refer to a defect in the auditory system which interferes with sound waves reaching the the cochlea. The locus of the lesion in conductive hearing losses lies in the outer or middle ear. Sensorineural impairments: refer to defects to the auditory pathways within the central nervous system, beginning with the cochlea and auditory nerve. Mixed impairments involve both conductive and sensorineural defects. Hearing impairments after 19 years of age do not seem to severely affect speaking ability and language. Hearing losses occurring from birth to 19 years of age are referred to as prevocational deafness or prelingual deafness. Tinnitus refers to a sound arising within or about the cochlea. Speech frequencies range from 250 to 8000 hertz.
