FRHD 2110 Lecture Notes - Lecture 13: Hearing Loss, Middle Ear, Etiology

• School: University of Guelph
• Department: Family Relations and Human Development
• Course: FRHD 2110
• Professor: Michelle Preyde

Document Summary

General term, any impairment with any part of transmission system (ear) Restriction in range of frequencies, or distortion, failure to perceive sounds. Hearing loss: deterioration in hearing (hard of hearing) By severity: mild = 25-40 db, moderate = 40-60 db, severe = 60-90 db, profound = 90+ db, decibels: smallest difference in loudness intensity that can be perceived. Zero db is point at which average can hear even faintest sound. By site of loss: conductive: mechanical problem in ear canal or middle ear that blocks the conduction of sound, sensorineural: damage to inner ear, auditory nerve, or auditory nerve pathways. By etiology: congenital: present from birth, adventitious: not present from birth. By age of onset: pre-lingual, post-lingual. 5% of ontarians deaf and have hearing impairments. 4 in 1000 canadian babies are born with some degree of hearing loss or will develop early progressive childhood hearing loss. Significant proportion who are learning english, significant challenge.