Frequency-specific audiometry using steady-state responses

Author(s): Picton, T. W., Boucher, B. L., Durieuxsmith, A., Champagne, S. C., Moran, L. M., Perezabalo, M. C., Martin, V., Savio, G.

Journal/Book: Ear Hearing. 1996; 17: 351 West Camden St, Baltimore, MD 21201-2436. Williams & Wilkins. 81-96.

Abstract: Objective: To evaluate the audiometric usefulness of steady-state responses to multiple simultaneous tones, amplitude-modulated at 75 to 110 Hz. Design: Steady-state responses to multiple tones amplitude-modulated at different rates between 75 and 110 Hz and presented simultaneously were recorded at different intensities in normal adults, well babies, normal adults with;simulated hearing loss, and adolescents with known hearing losses. Response thresholds were compared with behavioral thresholds. Results: In normal adults the thresholds for steady-state responses to tones of 0.5, 1, 2, and 4 kHz were 14 +/- 11, 12 +/- 11, 11 +/- 8, and 13 +/- 11 dB, respectively, above behavioral thresholds for air-conducted stimuli, and 11 +/- 5, 14 +/- 8, 9 +/- 8, and 10 +/- 10 dB above behavioral thresholds for bone-conducted stimuli. In well babies tested in a quiet environment, the thresholds were 45 +/- 13, 29 +/- 10, 26 +/- 8, and 29 +/- 10 dB SPL. In adolescents with known hearing losses, the steady-state responses thresholds predict behavioral thresholds with correlation coefficients (r) of 0.72, 0.70, 0.16, and 0.91 at 0.5, 1, 2, and 4 kHz, respectively. Conclusion: Steady-state responses to tones amplitude-modulated at 75 to 110 Hz can be used for frequency-specific objective audiometry. The multiple-stimulus technique allows thresholds to be estimated for eight different stimuli at the same time.

Note: Article OG Lins, Baycrest Ctr Geriatr Care, Rotman Res Inst, 3560 Bathurst St, N York, on M6A 2E1, Canada

Keyword(s): OTOACOUSTIC EMISSIONS; MODULATED TONES; POTENTIALS; AMPLITUDE; INFANTS; PATTERNS

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