Barry P. Kimberley
Dept. of Surgery, Univ. of Calgary, 3330 Hospital Dr. N. W., Calgary, Alberta T2N 4N1, Canada
Greg Shaw
Univ. of Calgary
Christopher Shera
Eaton Peabody Labs.
Jont B. Allen
Bell Labs.
Inner ear acoustic impedance and reflectance, SFOAEs, DPEs, and PTTs were
measured with a calibrated probe situated in the ear canal of normal-hearing
subjects. The use of a calibrated probe allowed for the conversion of the SFOAE
recordings into reflectance. In a number of subjects, low stimulus levels
results in rippling of the reflectance. The phase slope of the acoustic
reflectance was found to be a linear over a narrow range of frequencies. This
slope is taken as equivalent to the traveling wave delay to the corresponding
frequency(ies). Traveling wave delay estimates (reflectance phase slope)
however did not change as stimulus level ranged from 50 to 10 dB SPL. This is
in contrast to previous traveling wave delay estimates using DPEs where delay
increased with a decrease in stimulus level [Kimberley et al.,