Fig. 5
From: Delta opioid receptors affect acoustic features of song during vocal learning in zebra finches
Comparison of spectral and temporal features of the tutor’s songs to those in the songs of their offspring. (a) Sonograms demonstrating similarities in syllables (outlined) sung by one set of a tutor and his control and treated offspring. The asterisk represents a note only copied by the control bird. Bars graphs represent mean values and error bars represent standard deviation. The vertical scatter plots for these graphs represent the value of mean similarity and stereotypy values per bird in (b-f). The (b) frequency modulation, (b) pitch, and (c) mean frequency of the songs of control birds were similar to that of their fathers and significantly greater than that of the treated siblings. (e) Although these differences were not significant, overall similarity in the songs was the highest between control and treated siblings, who also had the shortest (f) Kolmogorov-Smirnov (KS) distance