Abstract
Evoked otoacoustic emissions (e-OAE) at a 2 kHz tone burst were measured in 37 ears of 21 cats. The e-OAE responses were detectable in 30 ears of 19 cats. In most cats (26 out of 30 ears) nonlinear behavior could be identified and saturated above 15 to 20 dBnHL. The responses had very short latencies (to their peak pressures) of 5.53 ms to 7.28 ms. Scanning electron microscopy (SEM) was used to examine feline cochleas for structural damage after exposure to a 2 kHz pure tone (105 dBSPL and 125 dBSPL). Following a 105dB exposure for 30 min acoustic response recovered to normal levels at 120 min after exposure with no significant loss of hair cell stereocilia. Fatigue induced changes in outer hair cell activity may be relevant to the production of TTS. The loss of stereocilia on outer hair cell row 1 and on inner hair cells was seen between 6 and 9 mm from the apex after exposure to a 125dBSPL, 2 kHz pure tone for 30 min and e-OAE disappeared after overstimulation in all these cases. We found that e-OAE was affected by minimal cochlear damage.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.