CSD 2230 HUMAN COMMUNICATION DISORDERS Topic 5 Hearing Disorders and Hearing Loss Assessment

Hearing Assessment Main questions 1. Is hearing normal? 2. What is the degree of hearing loss? 3. What type of hearing loss is it?

Hearing Assessment Procedrues Behavioral Measures Measures of hearing behavior dependent on the perceptions and cooperation of the listener Nonbehavioral Measures Acoustic or physiological responses recorded in association with an acoustic event

Pure Tone Audiometry Major behavioral auditory measure Measurement of pure tone thresholds between Hz Air conduction Bone conduction

Pure Tone Audiometry The results of PTA tell us 1. Air conduction thresholds across frequency tells us if hearing is normal or not 2. If hearing by air conduction is NOT normal, the thresholds tell us the degree of hearing loss

Average Air Conduction Threshold and the Degree of Hearing Loss

Pure Tone Audiometry The results of PTA tell us 1. Hearing by air conduction across frequency in each ear tells us if hearing is normal or not 2. If hearing by air conduction is NOT normal, the thresholds tell us the degree of hearing loss 3. Differences between hearing by air conduction and hearing by bone conduction tell us the type of hearing loss

Air Conduction vs Bone Conduction Testing n Air conduction tests the entire auditory system. Bone conduction bypasses the conductive mechanism, so it tests only the inner ear.

The Audiogram

What the Audiogram Says About the Impairment Within normal limits Mild Moderate Severe Profound/deaf

Determining the Type of Hearing Loss

What the Audiogram Says About the Impairment The degree of hearing loss The configuration of the hearing loss The type of hearing loss Conductive Sensorineural Mixed

Speech Audiometry Another behavioral measure of auditory ability Speech thresholds Speech Reception threshold Speech Awareness threshold Word recognition testing

Identifying Hearing Loss Through the First Year Communication checklists Parents’ reports Case history Informal observation Formal testing Visual Reinforcement Audiometry Behavioral Observation Audiometry

Sound Field Arrangement for VRA

Typical Response Levels to Sounds from Birth-2 years

Nonbehavioral Measures of Hearing Auditory brainstem evoked response (ABER)

Nonbehavioral Measures of Hearing Otoacoustic Emissions