FIGURE 2.

Single FM sweep (SFM) and pulse‐echo pairs (PED) stimuli. (a) Example stimuli in the SFM/PED set: The waveform and spectrogram of a single FM sweep with a duration of 5 ms (left), and a pulse‐echo pair with a duration of 5 ms and an echo delay of 10 ms (right). (b) schematic of the pulse‐echo pair stimuli. Three different durations and seven different echo delays were included. Note that there was no 5‐ms delay with a call duration of 5 ms to prevent overlap between the pulse and the echo