Lecture 15: Hearing Loss

Question 1

What could go wrong with hearing?

Answer 1

Conductive hearing loss (cannal/inner/middle ear)

Sensorineural hearing loss (in the cocohlear)

Question 2

Loss of OHC: deactivation from furosemide - Ruggero and rich 1991

Answer 2

found that responses of basilar membrane are dependant on the normal function of the organ of corti and strongly implicate the OHC

Question 3

Loss of OHC: magnitude estimation

Answer 3

Concluded that abnormally large loudness at an elevated threshold is likely to be a better definition of recruitment that the classical definition if it as an abnormally rapid growth of loudness above and elevated threshold

Question 4

Loss of OHC: loss of frequency selectivity

Answer 4

• In the impaired ear, there is a much slower improvement showing they also have impairments in frequency selectivity (only have the amplification from previous research at select frequencies.

Question 5

Loss of IHC: dead regions Moore et al 2000

Answer 5

IHC at diff points in the basilar membrane (frequency) - found the measurement of mased thresholds in TEN provides a quicker and simple method for detecting dead regions

Question 6

Loss of endocochlear potential (EP) Kujawa & Liberman 2009

Answer 6

Results suggest noise induced damage to ear has progressive consequences that re considerably widespread than are revealed by conventional threshold testing.