Influence of primary-level and primary-frequency ratios on human distortion product otoacoustic emissions

The combined influence of primary-level differences ( L 1 - L 2 ) and primary-frequency ratio ( f 2 ∕ f 1 ) on distortion product otoacoustic emission (DPOAE) level was investigated in 20 normal-hearing subjects. DPOAEs were recorded with continuously varying stimulus levels [ Neely J. Acoust. Soc....

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Bibliographic Details
Published in:The Journal of the Acoustical Society of America 2006, Vol.119 (1), p.418-428
Main Authors: Johnson, Tiffany A., Neely, Stephen T., Garner, Cassie A., Gorga, Michael P.
Format: Article
Language:English
Subjects:
Acoustic Stimulation
Acoustics
Audiometry, Pure-Tone
Audition
Auditory Threshold - physiology
Biological and medical sciences
Cochlea - physiology
Exact sciences and technology
Fundamental and applied biological sciences. Psychology
Fundamental areas of phenomenology (including applications)
Humans
Otoacoustic Emissions, Spontaneous - physiology
Perception
Physics
Psychology. Psychoanalysis. Psychiatry
Psychology. Psychophysiology
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Summary:The combined influence of primary-level differences ( L 1 - L 2 ) and primary-frequency ratio ( f 2 ∕ f 1 ) on distortion product otoacoustic emission (DPOAE) level was investigated in 20 normal-hearing subjects. DPOAEs were recorded with continuously varying stimulus levels [ Neely J. Acoust. Soc. Am. 117 , 1248-1259 ( 2005 ) ] for the following stimulus conditions: f 2 = 1 , 2, 4, and 8 kHz and f 2 ∕ f 1 = 1.05 to 1.4; various L 1 - L 2 , including one individually optimized to produce the largest DPOAE. For broadly spaced primary frequencies at low L 2 levels, the largest DPOAEs were recorded when L 1 was much higher than L 2 , with L 1 remaining relatively constant as L 2 increased. As f 2 ∕ f 1 decreased, the largest DPOAEs were observed when L 1 was closer to L 2 and increased as L 2 increased. Optimal values for L 1 - L 2 and f 2 ∕ f 1 were derived from these data. In general, average DPOAE levels for the new L 1 - L 2 and f 2 ∕ f 1 were equivalent to or larger than those observed for other stimulus combinations, including the L 1 - L 2 described by Kummer [ J. Acoust. Soc. Am. 103 , 3431-3444 ( 1998 ) ] and those defined by Neely in which L 1 - L 2 was evaluated, but f 2 ∕ f 1 was fixed at 1.2.
ISSN:0001-4966
1520-8524
DOI:10.1121/1.2133714