The Effect of Primary Levels and Frequencies on the Contralateral Suppression of Distortion Product Otoacoustic Emission
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Changes in distortion product otoacoustic emission (DPOAE)caused by contralateral suppression (CS) allow the function of the auditory efferent systemto be evaluated. Parameters affording maximum CS are preferred in terms of clinical application. Our objective was to evaluate the effects of primary levels and frequencies on DPOAEmediatedCS. Subjects and Methods: Sixteen subjects with normal hearing participated. DPOAEs were recorded with and without contralateral acoustic stimulation; we deliveredbroadband noise of 65 dB SPL at f2 frequencies between 1,000 Hz and 6,727 Hz, at 8 pt/octave. The L2 was varied between 40 dB SPL and 80 dB SPL in 10-dB steps. Results: L2did not significantly affect DPOAE-mediated CS. Higher L2 levels significantly reduced thefine structure depth of both the baseline and suppressed DPOAE datasets. The amount ofCS was greatly affected by the f2 frequency; lower and higher frequency ranges affordedsignificantly stronger suppression than did mid-frequencies within the studied range. Conclusions:Our findings suggest that DPOAE CS should be measured over a wide range offrequencies as the amount of CS seems to be highly dependent on f2. The use of a higherL2 level may be optimal when it is sought to evoke strong DPOAE-mediated suppressionwhile simultaneously minimizing DPOAE fine structure. Our findings may assist in optimizationof clinical procedures evaluating the integrity of the auditory efferent system.
Abstract
Changes in distortion product otoacoustic emission (DPOAE)caused by contralateral suppression (CS) allow the function of the auditory efferent systemto be evaluated. Parameters affording maximum CS are preferred in terms of clinical application. Our objective was to evaluate the effects of primary levels and frequencies on DPOAEmediatedCS. Subjects and Methods: Sixteen subjects with normal hearing participated. DPOAEs were recorded with and without contralateral acoustic stimulation; we deliveredbroadband noise of 65 dB SPL at f2 frequencies between 1,000 Hz and 6,727 Hz, at 8 pt/octave. The L2 was varied between 40 dB SPL and 80 dB SPL in 10-dB steps. Results: L2did not significantly affect DPOAE-mediated CS. Higher L2 levels significantly reduced thefine structure depth of both the baseline and suppressed DPOAE datasets. The amount ofCS was greatly affected by the f2 frequency; lower and higher frequency ranges affordedsignificantly stronger suppression than did mid-frequencies within the studied range. Conclusions:Our findings suggest that DPOAE CS should be measured over a wide range offrequencies as the amount of CS seems to be highly dependent on f2. The use of a higherL2 level may be optimal when it is sought to evoke strong DPOAE-mediated suppressionwhile simultaneously minimizing DPOAE fine structure. Our findings may assist in optimizationof clinical procedures evaluating the integrity of the auditory efferent system.
참고문헌 (30)
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