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Schematic auditory brainstem responses (ABRs). A: Reconstructed ABR from the left ear of a 15-year-old macaque with peaks II and IV labeled when present. B: ABR thresholds from the seven monkeys in which ABRs were collected for all stimuli (clicks and low-, middle-, and high-frequency tones). Threshold was defined as the last stimulus intensity in which wave II and wave IV were observable.
