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Chapter 13

Chapter 13.docx

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Stuart Kamenetsky

Chapter 13 - hearing hearing loss  people with hearing loss get info about the world through lipreading, writing, gestures, pictures  some people use their residual hearing with the help of hearing aids; others don’t bc makes distorted sound louder  some with hearing loss use their voice, others use sign -> common language is American sign language  most people use combo of voices and gestures auditory process  auditory process starts with the source (vibrator such as reed or string) which causes displacement of air particles  displacement causes pattern of circular waves - called sound waves, which is transmitted from the source to the receiver though the medium (air, water or metal)  ear (source) collects, processes and transmits info to the brain where it is decoded into meaningful units hearing loss  whether you are deaf or hard of hearing depends on your level of hearing impairment which is assessed by measuring your sensitivity to loudness at diff freq  loudness o measured in db o range of human hearing 0-130db ->above 130 results in pain o range of speech 40-60db  pitch o measured in hz o frequency - number of cycles per sec o range of human hearing 20-20 000hz o range of speech 300- 4000hz deaf and hard of hearing  deafness - hearing impairment that is so severe that an individual is impaired (unable) to process linguistic (sound) information through hearing, with or without amplification o usually above 90db o might have some residual hearing at certain freq but unable to determine the meaning  hard of hearing - sense of hearing is impaired but is somewhat functional o individuals who have enough residual hearing that through amplification (help of hearing aids) they can process linguistic information age of onset  prelingual loss - hearing loss before language is acquired (2 years of age)  postlingual loss - hearing loss after language is acquired  9/10 kids have prelingual loss  the earlier the loss - the more challenges types of hearing loss  congenital hearing loss - hearing loss at birth - peripheral hearing losses  conductive hearing impairment o type of hearing impairment that results from poor conduction of sound through the pathways leading to the sensory organ (inner ear) o effect is usually reduction or loss of loudness o this type of hearing impairment can usually be treated medically or surgically  sensoryneural hearing impairment o type of hearing impairment that results from damage to the inner ear (cochlea) or auditory nerve leading from the inner ear to the brain o most of the time it cannot be medically or surgically treated o more severe than conductive hearing loss air and bone conduction test - conductive impairment: cant hear the tuning fork through the ear but can hear if applied to the scull; sensory neutral: cant hear the tuning fork regardless of placement  mixed hearing loss o both sensoryneural and conductive hearing problems - central hearing loss - dysfunction in the cerebral cortex; problems are not due to inability to hear sound but not being able to discriminate and perceive the sound (problem is in the br
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