Scaling of timing parameters with average length.

<p>A, Scatter plot of global tempo variability by average interval duration across all syllables and silent gaps. Silent gaps within motifs and between motifs have been separated out. B, C, Analogous plots for the independent and jitter parameters respectively. In each plot solid lines come from a regression of timing parameters on average interval duration, calculated across birds. Overall, plots show that global and independent variability scale with average duration, while jitter does not. The plots also show systematic differences among interval types with respect to how much each parameter scales with average duration.