Spontaneous basilar membrane oscillation and otoacoustic emission at 15 kHz in a guinea pig.
J Assoc Res Otolaryngol
; 5(4): 337-48, 2004 Dec.
Article
en En
| MEDLINE
| ID: mdl-15674999
ABSTRACT
A spontaneous otoacoustic emission (SOAE) measured in the ear canal of a guinea pig was found to have a counterpart in spontaneous mechanical vibration of the basilar membrane (BM). A spontaneous 15-kHz BM velocity signal was measured from the 18-kHz tonotopic location and had a level close to that evoked by a 14-kHz, 15-dB SPL tone given to the ear. Lower-frequency pure-tone acoustic excitation was found to reduce the spontaneous BM oscillation (SBMO) while higher-frequency sound could entrain the SBMO. Octave-band noise centered near the emission frequency showed an increased narrow-band response in that frequency range. Applied pulses of current enhanced or suppressed the oscillation, depending on polarity of the current. The compound action potential (CAP) audiogram demonstrated a frequency-specific loss at 8 and 12 kHz in this animal. We conclude that a relatively high-frequency spontaneous oscillation of 15 kHz originated near the 15-kHz tonotopic place and appeared at the measured BM location as a mechanical oscillation. The oscillation gave rise to a SOAE in the ear canal. Electric current can modulate level and frequency of the otoacoustic emission in a pattern similar to that for the observed mechanical oscillation of the BM.
Texto completo:
1
Bases de datos:
MEDLINE
Asunto principal:
Membrana Basilar
/
Emisiones Otoacústicas Espontáneas
Límite:
Animals
Idioma:
En
Revista:
J Assoc Res Otolaryngol
Asunto de la revista:
OTORRINOLARINGOLOGIA
Año:
2004
Tipo del documento:
Article
País de afiliación:
Estados Unidos