Fig 4.

Mean ± SE. of (A) activity (i.e. the number of zone changes), (B) number of calls emitted by the subjects, (C) the time the subjects spent in zone 1 (i.e. near the loudspeaker) and (D) the time the subjects spent with crest in position 1 (i.e. erected) in the phases before, during and after the playback stimuli. Although the “time spent near the loudspeaker” and “time spent with crest in position 1” were analysed as binomial variables (see text), they are displayed here as continuous variables for illustrative purposes. Statistical differences between conditions (before, during, after) are given (***: p < 0.001; **: p < 0.01; *: p < 0.05;.: p = 0.07).