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Acoustic stimulus waveforms. (A) Synthetic standard call with an inset showing two pulses to illustrate the shapes of pulses and the pulsatile structure of the sound (pulse rate=45.5 pulses s−1). (B) A sinusoidally amplitude-modulated (SAM) tone with an inset showing two periods of sinusoidal modulation (modulation rate=45.1 Hz). Scale bars indicate time.
