Fig. 4
From: Delta opioid receptors affect acoustic features of song during vocal learning in zebra finches
Comparison of syllable order between control and naltrindole-treated birds. 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 all graphs. Values for (a) linearity, (b) consistency and (c) stereotypy were higher for controls than for naltrindole-treated birds, with the largest difference observed in linearity