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EEOAE waveforms in the bobtail lizard measured during electrical stimulation and modulation by low-frequency tones. (a—c) EEOAE generated in Scala media by ac current (5.0 μA) of frequency 1593 Hz, modulated by a tone of 172 Hz with levels of 68, 78, and 88 dB SPL, respectively. (d—f) EEOAE from a different animal, in this case generated by ac current (3.8 μA) of frequency 2497 Hz, modulated by 344 Hz tones at 86, 96, and 106 dB SPL, respectively.
