Number of calls emitted and calling rate during playback trials.

Trials are organized by stimulus presentation order and playback rate. Blocks (3 min each) are identified as No Stimulus (NS), Ultrasonic (US), Background noise (negative) control (BKG), and Audible (AUD). Italicized values are the number of calls emitted by the focal male during each block. Numbers in bold are calling rates (calls/min) during US stimulus presentation. For the first five frogs in the table, the US and BKG stimuli were presented once per 10 s.*Calling rate during the first minute of the US block when the stimulus was presented once per second, and during the second 2 min when the stimulus was presented once per 10 s.**Calling rate for the US stimulus presented once per 5 s.