Fig. 3

Volitional control of call type in a discrimination task shown in monkey H. a Spectrograms of vocalization types. Trills and call combinations had to be uttered in response to the red visual cue (go1); chirps and chirp sequences had to be uttered in response to the blue visual cue (go2). b Distribution of go rates for ten sessions in the initial and final training phase of the visual discrimination task. Whiskers indicate standard error (SE). c Distribution of correct call types uttered during go1 and go2 cues in the initial and final training phase. Whiskers indicate standard error (SE). b, c *p < 0.05, **p < 0.01, Wilcoxon signed-rank test. d, e Call probabilities during go1 and go2 trials in the initial (d) and final phase (e) of visual discrimination training (e). Shaded areas indicate SE