Mp. Feeney et Dh. Keefe, Acoustic reflex detection using wide-band acoustic reflectance, admittance, and power measurements, J SPEECH L, 42(5), 1999, pp. 1029-1041
The measurement of the acoustic reflex threshold is a basic component of th
e diagnostic audiological test battery that may subject patients to potenti
ally harmful sound pressures. A wide-band acoustic impedance and reflectanc
e 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 p
roviding a,,, complete characterization of the reflex than current clinical
methods provide. Reflex thresholds obtained by measuring changes in wide-b
and admittance, reflectance and power were at least 8 dB lower than those o
btained 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.