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. 2019 Apr 26;11:97. doi: 10.3389/fnagi.2019.00097

FIGURE 1.

FIGURE 1

DPOAE measurements. (A) Example of the spectrogram of the microphone signal used to obtain the 2f1–f2 DPOAEs in response to f1 and f2 stimuli. DPOAE amplitudes are about 40–50 dB smaller than f1 and f2 primary tones. (B) Mean DPOAE amplitudes in response to the eight frequencies for left (blue) and right (red) ears (data shown as mean ± SEM). Notice that low frequency DPOAEs are larger in amplitude than high frequency DPOAEs. (C) Frequency histogram of the number of detectable DPOAE per subject for left (blue) and right (red) ears. Note that 24 and 26 subjects had no detectable DPOAEs in right and left ears, respectively.