Acoustic reflex detection using wide-band acoustic reflectance, admittance, and power measurements

Author(s): Keefe, D. H.

Journal/Book: J Speech Lang Hear Res. 1999; 42: 10801 Rockville Pike, Rockville, MD 20852-3279, USA. Amer Speech-Language-Hearing Assoc. 1029-1041.

Abstract: The measurement of the acoustic reflex threshold is a basic component of the diagnostic audiological test battery that may subject patients to potentially harmful sound pressures. A wide-band acoustic impedance and reflectance system (D. H. Keefe, R. Ling, & J. C. Bulen, 1992) was investigated as a means of obtaining reflex thresholds at a reduced level and as a means of providing a,,, complete characterization of the reflex than current clinical methods provide. Reflex thresholds obtained by measuring changes in wide-band admittance, reflectance and power were at least 8 dB lower than those obtained with th, standard clinical technique. These reflex-induced changes were accounted for by a simple oscillator model of the middle ear, assuming that the acoustic reflex results in an increase in stiffness. The results support further investigation of reflectance-based measures of the acoustic reflex as a clinical tool and as a means of studying the reflex mechanism.

Note: Article Feeney MP, Ohio Univ, Sch Hearing & Speech Sci, Lindley Hall 218, Athens,OH 45701 USA

Keyword(s): energy reflectance; acoustic reflex; acoustic impedance; immittance; OTOACOUSTIC EMISSIONS; IMPEDANCE; COEFFICIENT; MIDDLE

Zurück | Weiter