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Representative ABR waveforms in response to a 2 kHz pure tone recorded from a single zebra finch. Tone stimuli were presented over a range of intensities without noise (left), and simultaneously with broadband white noise at 44 dB SPL (second column), 54 dB SPL (third column), and 64 dB SPL (right column). Each waveform corresponds to the average of 300 acquisitions. The arrows indicate thresholds estimated by visual detection.
