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Comparison of distortion product otoacoustic emissions (DPOAEs) measured before and 8 or 12 weeks following bilateral kainate exposure. DPOAE level is plotted as a function of the f2 frequency of swept-tone stimulus presented to the right ear with the noise floor depicted in gray; left ear results are similar (data not shown). The six tested sound levels of the primary tones are indicated at the top of each panel. Kainate exposure had no apparent impact on hair cell-generated DPOAEs
