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Middle Components of the AER to Tone-Pips in Normal-Hearing and Hearing-Impaired Subjects

Michael C. Vivion
Robert Goldstein
University of Wisconsin, Madison

Tone-pips of 500, 1000, and 3000 Hz were presented at 0-, 10-, 20-, 35-, and 50-dB HL to 10 normal-hearing subjects and at 0-, 10-, 20-, 35-, and 50-dB SL to 10 subjects with conductive, sensorineural, or mixed hearing losses. Middle component (latencies 8–90 msec) averaged electroencephalic responses to the tone-pips were analyzed in terms of peak latencies and peak-to-peak amplitudes. Properties of the responses were generally the same for both normal-hearing and hearing-impaired subjects except that the hearing-impaired subjects showed slightly greater amplitudes overall. The small reduction in latencies with increasing stimulus frequency seen in the normal-hearing subjects was not observed in the hearing-impaired subjects.