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Figure 4. DPOAE input/output functions before and after (15 min, 4 days, 20 days) exposure to the noise. Solid and dashed lines without symbols represent pre-exposure values for left (n=12) and right (n=12) ears, respectively. Filled circles are for saline-treated ears; open circles are for BSO-treated ears. Significant differences between BSO and control ears were observed at 2, 4 and 8 kHz, four days after noise exposure.

Figure 4. DPOAE input/output functions before and after (15 min, 4 days, 20 days) exposure to the
noise. Solid and dashed lines without symbols represent pre-exposure values for left (n=12) and right
(n=12) ears, respectively. Filled circles are for saline-treated ears; open circles are for BSO-treated
ears. Significant differences between BSO and control ears were observed at 2, 4 and 8 kHz, four days
after noise exposure.