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Journal of Speech and Hearing Disorders Vol.55 198-205 May 1990.
© American Speech-Language-Hearing Association
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Acoustic Reflex Thresholds in Normal and Cochlear-Impaired Ears

Effects of No-Response Rates on 90th Percentiles in a Large Sample

Stanley A. Gelfand 1, Teresa Schwander 2, and Shlomo Silman 3

1 Queens College of the City University of New York, Flushing, NY
2 Veterans Administration Medical Center, East Orange, NJ
3 Brooklyn College of the City University of New York, Brooklyn, NY

Ninetieth percentile cutoffs for acoustic reflex thresholds (ARTs) were determined for a sample of 2,748 ears of 1,374 subjects with normal hearing and sensorineural loss of cochlear origin. All subjects had measurable hearing (le110 dB HL, ANSI-1969) at all three activator frequencies (500, 1000, and 2000 Hz). Cutoff values including "no responses" ("absent" reflexes at 125 dB HL) were higher than those excluding no responses when hearing losses were greater than about 55 dB. The 90th percentiles including the effects of no responses identified ears with retrocochlear involvement for hearing losses as great as about 75 dB. For greater hearing losses at the activator frequency, the no-response rate for both cochlear and retrocochlear cases is too high to enable them to be differentiated by acoustic reflex thresholds. The 90th percentiles are derived at each activator frequency collapsed across ears. It is therefore necessary to determine the probabilities that normal or cochlear-impaired ears will have one, two, or three frequencies at which the ARTs exceed their respective 90th percentiles. It was found that among normal and cochlear-impaired ears, 12.2% have one ART elevated above the 90th percentile, but only 5.6% have two or three elevated ARTs. Clinical implications are discussed.

Key Words: acoustic reflex threshold • 90th percentiles • cochlear impairment • retrocochlear pathology

Submitted on December 27, 1988
Accepted on June 15, 1989




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S. Gordon-Salant, P. J. Fitzgibbons, and S. A. Friedman
Recognition of Time-Compressed and Natural Speech With Selective Temporal Enhancements by Young and Elderly Listeners
J Speech Lang Hear Res, October 1, 2007; 50(5): 1181 - 1193.
[Abstract] [Full Text] [PDF]


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