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Compound action potential tuning curves in normal and pathological human ears



Compound action potential tuning curves in normal and pathological human ears



Journal of the Acoustical Society of America 62(5): 1247-1251



Using a tone-on-tone masking procedure to just mask a compound action potential (AP) evoked by a 10 dB SL [sensation level] short toneburst yielded frequency-intensity combinations for the tonal masker called AP tuning curves. This procedure was used in addition to the standard electrocochleography procedure to obtain information about the peripheral frequency selectivity. Both methods were performed on a (normal) group of patients having normal or nearly normal (within 15 dB) thresholds for frequencies above and including 1 kHz, and in patients having hearing losses of sensorineural origin exceeding 40 dB HL [hearing level]. In normal ears the characteristic 2-segment tuning curves were obtained. For pathological ears having a hearing loss of cochlear origin, turning curves broadening by the loss of their sharp tips were obtained. There was some indication that in predominant neural hearing loss most of the sharp tuning was preserved. The changes in tuning associated with recovery from sudden deafness to almost normal hearing were reported. The results were in agreement with those from AP tuning curves reported in animal studies and with changes in single-fiber turning in reversible hearing loss.

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Accession: 005024123

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PMID: 915117


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