Effects of acoustic trauma on acoustic enhancement of electrically evoked otoacoustic emissions.
J Acoust Soc Am
; 107(5 Pt 1): 2603-14, 2000 May.
Article
in En
| MEDLINE
| ID: mdl-10830383
ABSTRACT
Moderate acoustic trauma results in decreased cochlear sensitivity and frequency selectivity. This decrease is believed to be caused by damage to the cochlear amplifier that is associated with outer hair cells (OHCs) and their nonlinear electromechanical characteristics. A consequence of OHC nonlinearity is the acoustic enhancement effect, in which low-frequency electrically evoked otoacoustic emissions are enhanced by a simultaneous tone. The present study found that acoustic trauma reduced the acoustic enhancement effect and this reduction is correlated with the N1 threshold at the electrode site. This result is consistent with the theory that trauma affects the mechanoelectric transduction process, thus affecting cochlear mechanical nonlinearity. Acoustic trauma also reduced the cochlear microphonic in a way that suggests that the number of functioning tension-gated channels and the stiffness of the gating springs were decreased. In some cases, the electromechanical transduction process was also found to be affected by acoustic trauma.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Otoacoustic Emissions, Spontaneous
/
Cochlea
/
Hearing Loss, Noise-Induced
Limits:
Animals
Language:
En
Journal:
J Acoust Soc Am
Year:
2000
Document type:
Article
Affiliation country: