The Time-Course of the Effects of Contralateral Sound on the Level of Distortion Product Otoacoustic Emissions

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  • Sasaki Naoko
    Department of Otolaryngology, Head and Neck Surgery, Tohoku University Graduate School of Medicine
  • Kawase Tetsuaki
    Department of Otolaryngology, Head and Neck Surgery, Tohoku University Graduate School of Medicine
  • Ogura Masaki
    Department of Otolaryngology, Head and Neck Surgery, Tohoku University Graduate School of Medicine
  • Takasaka Tomonori
    Department of Otolaryngology, Head and Neck Surgery, Tohoku University Graduate School of Medicine

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The effects of the addition of contralateral noise on the level of distortion product otoacoustic emissions (DPOAEs) were examined. In the present study, the DPOAEs were recorded for a relatively long period (2 minutes), and the time-course of the effects of contralateral sound on the level of DPOAEs were considered. In general, the addition of the contralateral noise resulted in suppression of the level of DPOAEs. The time-course of this suppression appeared to depend on the level of the contralateral noise. When the level of the contralateral noise was low, the suppression of the level of DPOAEs seemed to be largely unchanged for at least 2 minutes. In contrast, when a relatively high level of contralateral noise was used, the suppression of the level of DPOAEs decreased with time.

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