Exploring Optimal Stimulus Frequency Ratio for Measurement of the Quadratic F[subscript 2]-F[subscript 1] Distortion Product Otoacoustic Emission in Humans

Autor/inn/en	Baiduc, Rachael R.; Dhar, Sumitrajit
Titel	Exploring Optimal Stimulus Frequency Ratio for Measurement of the Quadratic F[subscript 2]-F[subscript 1] Distortion Product Otoacoustic Emission in Humans
Quelle	In: Journal of Speech, Language, and Hearing Research, 61 (2018) 7, S.1794-1806 (13 Seiten) PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	1092-4388
DOI	10.1044/2018_JSLHR-H-17-0349
Schlagwörter	Hearing (Physiology); Acoustics; Adults; Auditory Stimuli; Measurement + Suchen Sie Ihr Suchwort? Gehör; Hören; Akustik; Auditive Stimulation; Messverfahren
Abstract	Purpose: Distortion product otoacoustic emissions (DPOAEs) are a by-product of active cochlear processes that lead to the compressive nonlinearity of healthy ears. The most commonly studied emission is at the frequency 2f[subscript 1]-f[subscript 2] , but there has been recent interest in using the quadratic distortion product at the frequency f[subscript 2]-f[subscript 1] to detect cochleopathies including endolymphatic hydrops. Before the DPOAE at f[subscript 2] -f[subscript 1] can be applied clinically in any capacity, optimal stimulus parameters for its elicitation must be established. Method: We investigated stimulus parameters for the DPOAEs at f[subscript 2]-f[subscript 1] and 2f[subscript 1]-f[subscript 2] in 23 adults with normal hearing. Logarithmically swept tones between approximately 0.6 and 20 kHz (L[subscript 1] = L[subscript 2] = 70 dB SPL) served as the higher frequency stimulus (f[subscript 2]). DPOAEs were measured for 6 f[subscript 2]/f[subscript 1] ratios: 1.14, 1.18, 1.22, 1.30, 1.32, and 1.36. Results: Both DPOAEs were consistently measurable. In line with previous investigations, the highest levels of the DPOAE at 2f[subscript 1]-f[subscript 2] were generated between f[subscript 2]/f[subscript 1] ratios of 1.14-1.22, with a peak in the level ratio function at 1.22. In contrast, f[subscript 2]-f[subscript 1] was less influenced by ratio, although the narrowest ratio (1.14) produced slightly higher levels across frequency. Conclusion: The DPOAE at f[subscript 2]-f[subscript 1] is measurable in individuals with normal hearing up to f[subscript 2] of 20 kHz at narrow f[subscript 2]/f[subscript 1] ratios. Measurements at additional stimulus levels and in subjects with hearing impairment will be needed before clinical implementation. (As Provided).
Anmerkungen	American Speech-Language-Hearing Association. 2200 Research Blvd #250, Rockville, MD 20850. Tel: 301-296-5700; Fax: 301-296-8580; e-mail: slhr@asha.org; Web site: http://jslhr.pubs.asha.org
Erfasst von	ERIC (Education Resources Information Center), Washington, DC
Update	2020/1/01