Amplitude of distortion product otoacoustic emissions in the guinea pig in f(1)- and f(2)-sweep paradigms

Hearing Research
S SchneiderV F Prijs

Abstract

The amplitude versus frequency relations of distortion product otoacoustic emissions (DPOAEs) were studied in the guinea pig, using both the f(1)- and the f(2)-sweep paradigms to vary the primary frequency separation. The amplitude of the DPOAEs 2f(1)-f(2), 3f(1)-2f(2), 4f(1)-3f(2), and 2f(2)-f(1), plotted as a function of DP frequency, exhibited a bandpass structure. The separation of the primaries for which the DPOAE level is maximum is referred to as the optimum ratio f(2)/f(1). For the lower sideband DPOAEs (f(dp)<f(1), f(2)), the optimum ratio varies non-monotonically with the primary frequency region. At an f(2) around 4.4 kHz, the optimum ratio for 2f(1)-f(2) reaches a maximum of about 1.46 while elsewhere it is in the more commonly found 1.2-1.3 range. The width of the amplitude profiles was studied by determining their Q(10 dB). The f(2)-sweep yielded significantly larger Q(10 dB) than f(1)-sweep, for the lower sideband DPOAEs. The amplitude versus frequency functions of the lower sideband DPOAEs approximately line up. Upon closer inspection, however, with f(1)-sweep the 2f(1)-f(2) DPOAE has its maximum at a slightly smaller DP frequency than the higher order DPOAEs. With f(2)-sweep, on the contrary, the 2f(1)-f(2) ten...Continue Reading

References

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Jun 30, 2000·The Journal of the Acoustical Society of America·V F PrijsR Schoonhoven

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Citations

Oct 27, 2006·ORL; Journal for Oto-rhino-laryngology and Its Related Specialties·H Duifhuis
Jan 6, 2001·The Journal of the Acoustical Society of America·C A SheraA Tubis
Apr 28, 2001·The Journal of the Acoustical Society of America·R SchoonhovenS Schneider
Feb 15, 2007·The Journal of the Acoustical Society of America·Andrei N LukashkinIan J Russell
Jan 12, 2002·The Journal of the Acoustical Society of America·A N Lukashkin, I J Russell
Jun 26, 2003·The Journal of the Acoustical Society of America·Sandra SchneiderRuurd Schoonhoven

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