Objectives of middle-ear research (14 of 24)

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1. Motivation

2. Research objectives

3.1 Adults

3.2 Newborns

3.2 Newborns (cont'd)

4.1 Audiogram

4.2 Auditory brainstem response

4.2 Auditory brainstem response (cont'd)

4.3 Otoacoustic emissions

4.3 Otoacoustic emissions (cont'd)

4.3.1 Limitations

4.4 Acoustical input admittance

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4.5 Tympanometry

4.5 Tympanometry (cont'd)

5.1 Passive prostheses

5.1 Passive prostheses (cont'd)

5.1 Passive prostheses (cont'd)

5.1 Passive prostheses (cont'd)

5.2 Passive external devices

5.3 Hearing aids and implants

6. Inner ear

7. Teaching

4.4 Acoustical input admittance (cont'd)

OAE diagram

Diagram of admittance measurement

Possible use for differential diagnosis
Sound stimulus
- single frequency (e.g., 226 Hz)
- multiple frequencies (e.g., 226, 678, 1000 Hz)
- wideband (e.g., chirp, up to 8 kHz)
Ear canal + middle ear
Reflectance
- derived from admittance
- reduce dependence on probe position?

After Cull (1989): The Sourcebook of medical illustration, Parthenon, Carnforth, xxiii+481 pp.

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BMDE-501 Modelling middle-ear mechanics

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