Modulation Detection by Patients with Eighth-Nerve Tumors Detection thresholds for sinusoidally amplitude-modulated broad-band noise were measured as a function of modulation frequency for 4 normally hearing listeners and for 6 patients suffering eighth-nerve tumors. Measurements were obtained using a method-of-adjustment (MOA) procedure. On average, the threshold values revealed that more modulation was needed across all modulation frequencies ... Research Article
Research Article  |   September 01, 1986
Modulation Detection by Patients with Eighth-Nerve Tumors
 
Author Affiliations & Notes
  • C. Formby
    University of Florida, Gainesville University of Alabama, Birmingham
  • Portions of this research were presented at the annual meeting of American Speech- Language-Hearing Association. Asha, 26, 150.
    Portions of this research were presented at the annual meeting of American Speech- Language-Hearing Association. Asha, 26, 150.×
Article Information
Research Articles
Research Article   |   September 01, 1986
Modulation Detection by Patients with Eighth-Nerve Tumors
Journal of Speech, Language, and Hearing Research, September 1986, Vol. 29, 413-419. doi:10.1044/jshr.2903.413
History: Received March 3, 1985 , Accepted April 4, 1986
 
Journal of Speech, Language, and Hearing Research, September 1986, Vol. 29, 413-419. doi:10.1044/jshr.2903.413
History: Received March 3, 1985; Accepted April 4, 1986

Detection thresholds for sinusoidally amplitude-modulated broad-band noise were measured as a function of modulation frequency for 4 normally hearing listeners and for 6 patients suffering eighth-nerve tumors. Measurements were obtained using a method-of-adjustment (MOA) procedure. On average, the threshold values revealed that more modulation was needed across all modulation frequencies for the patients' affected ears relative to either the normally hearing listeners or the patients' better ears. The cutoff frequency derived from the average modulation-threshold function (MTF) for the affected ears was about half the normal value. For a simple lowpass-filter model of the process, the latter result suggested a doubling of the auditory time constant in the affected ears. These patients, on average, exhibited the characteristic high-frequency audiometric hearing loss most often associated with eighth-nerve tumors. Their MTFs closely resembled MTFs described previously for high-frequency and simulated high-frequency audiometric hearing loss. The results of statistical analyses suggested that high-frequency audiometric hearing loss, irrespective of other influences, is the most parsimonious explanation for the increased modulation thresholds measured for the eighth-nerve tumor patients.

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