Table 1. Measures of response recorded during playback experiments.

Measured variable
Total duration of movements (s)
Duration of movements between 10 and 5 m from the loudspeaker (s)
Duration of movements between 5 and 0 m from the loudspeaker (s)
Latency to the first movement (s)
Latency to approach at less than 10 m from the loudspeaker (s)
Latency to approach at less than 5 m from the loudspeaker (s)
Time spent between 10 and 5 m from the loudspeaker (s)
Time spent between 5 and 0 m from the loudspeaker (s)
Latency before the first song (s)
Duration of songs (s)
Total number of calls