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Journal of Speech, Language, and Hearing Research Vol.46 128-136 February 2003. doi:10.1044/1092-4388(2003/010)
© American Speech-Language-Hearing Association
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Contralateral Acoustic Reflex Thresholds for Tonal Activators Using Wideband Energy Reflectance and Admittance

M. Patrick Feeney 1
Douglas H. Keefe 2

Lindsay P. Marryott 1
1 The Ohio State University Columbus, OH
2 Boys Town National Research Hospital Omaha, NE

pfeeney{at}u.washington.edu

The purpose of this study was to evaluate a new method for estimating the acoustic reflex threshold incorporating wideband (250–8000 Hz) measures of energy reflectance and admittance (M. P. Feeney & D. H. Keefe, 2001). The wideband technique incorporates both a correlation method to assess the pattern of the reflex-induced shifts in reflectance and admittance across frequency and a magnitude method to determine if the amplitude of the shifts exceeds baseline variability. Contralateral reflex thresholds for 1000- and 2000-Hz activators were obtained for 34 young adults with both the wideband method and a clinical method using a 226 Hz probe tone. Average reflex thresholds obtained with the new method were 12 to 13.7 dB lower than those obtained with the clinical method. When the bandwidth of analysis of admittance and reflectance responses was limited to 250 to 2000 Hz, the reduction in reflex thresholds was accompanied by the rejection of 96% of nonactivator-baseline responses as reflexes. The method holds promise for extending reflex threshold testing to patients with reflexes elevated beyond current equipment limits, for reducing the sound levels used in reflex testing, and for obtaining sensitive measures of reflex threshold in infants.

KEY WORDS: immittance, reflex threshold, energy reflectance, admittance, middle ear

Submitted on November 13, 2001
Accepted on May 28, 2002




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J. E. Day and M. P. Feeney
The Effect of the 226-Hz Probe Level on Contralateral Acoustic Stapedius Reflex Thresholds
J Speech Lang Hear Res, August 1, 2008; 51(4): 1016 - 1025.
[Abstract] [Full Text] [PDF]


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