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Figure 4. DPOAE I/Ocurves of the cubic distortion products (CDP SEM) of the two groups of rats made with a constant ratio of the primary tones (f2/f1 = 16/13 = 1.23) and with the level of f1 10 dB higher than the level of f2. The CDPs differs significantly at both 12.8 and 16.384 kHz at the f2 level of 60 dB SPL and downwards. The CDP also differs at 8.192 kHz at the highest levels of f2 (75 and 80 dB SPL).

Figure 4. DPOAE I/Ocurves of the cubic distortion products (CDP  SEM) of the two groups of rats made with a constant ratio of the primary tones (f2/f1 = 16/13 = 1.23) and with the level of f1 10 dB higher than the level of f2. The CDPs differs significantly at both 12.8 and 16.384 kHz at the f2 level of 60 dB SPL and
downwards. The CDP also differs at 8.192 kHz at the highest levels of f2 (75 and 80 dB SPL).