TY - JOUR
T1 - The sources of electrically evoked otoacoustic emissions
AU - Zou, Yuan
AU - Zheng, Jiefu
AU - Nuttall, Alfred L.
AU - Ren, Tianying
N1 - Funding Information:
The study was supported by Grants R01 DC04554 and R01 DC 141 from the National Institute of Deafness and Other Communication Disorders, National Institutes of Health; and VA RR&D Center Grant RCTR-597-0160, Portland VAMC.
PY - 2003/6
Y1 - 2003/6
N2 - It has been hypothesized that electrically evoked otoacoustic emissions (EEOAEs) are generated at a site on the basilar membrane near the stimulating electrode. From this original site, the energy propagates towards the oval window, giving rise to the short time delay component (SDC) of EEOAEs. The energy also propagates towards its characteristic frequency (CF) location, and the emission reflected from the CF location forms a long time delay component (LDC). This hypothesis is directly tested in this study by using an acoustical swept tone to modulate the EEOAEs generated by alternating electric current delivered to the round window niche in gerbils. An acoustical tone with a high sound pressure level or a small frequency separation from the EEOAE frequency induced a strong suppression of the EEOAE LDC, but no obvious suppression of the SDC. When the electrical current frequency was fixed, the swept acoustic tone induced a slight suppression, an enhanced peak, and a strong suppression of EEOAEs as the acoustic frequency was swept from the low to high frequency. These data indicate that the electrical current induced cochlear partition vibration near the stimulating electrode. One part of this energy propagates directly to the ear canal, forming the SDC, and the other part propagates to its CF place and is reflected from there to the ear canal, forming the LDC.
AB - It has been hypothesized that electrically evoked otoacoustic emissions (EEOAEs) are generated at a site on the basilar membrane near the stimulating electrode. From this original site, the energy propagates towards the oval window, giving rise to the short time delay component (SDC) of EEOAEs. The energy also propagates towards its characteristic frequency (CF) location, and the emission reflected from the CF location forms a long time delay component (LDC). This hypothesis is directly tested in this study by using an acoustical swept tone to modulate the EEOAEs generated by alternating electric current delivered to the round window niche in gerbils. An acoustical tone with a high sound pressure level or a small frequency separation from the EEOAE frequency induced a strong suppression of the EEOAE LDC, but no obvious suppression of the SDC. When the electrical current frequency was fixed, the swept acoustic tone induced a slight suppression, an enhanced peak, and a strong suppression of EEOAEs as the acoustic frequency was swept from the low to high frequency. These data indicate that the electrical current induced cochlear partition vibration near the stimulating electrode. One part of this energy propagates directly to the ear canal, forming the SDC, and the other part propagates to its CF place and is reflected from there to the ear canal, forming the LDC.
KW - Characteristic frequency
KW - Cochlea
KW - Electrical stimulation
KW - Electrically evoked otoacoustic emission
KW - Gerbil
KW - Otoacoustic emission
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U2 - 10.1016/S0378-5955(03)00110-2
DO - 10.1016/S0378-5955(03)00110-2
M3 - Article
C2 - 12782357
AN - SCOPUS:0038699229
SN - 0378-5955
VL - 180
SP - 91
EP - 100
JO - Hearing Research
JF - Hearing Research
IS - 1-2
ER -