Relationship between the Sequencing and Timing of Vocal Motor Elements in Birdsong
Fig 3
Relationship between age-dependent changes to transitions probabilities and gap durations within branch points.
(a). An example of age-dependent changes to gap durations as a function of age-dependent changes to transition probabilities. Gap durations decreased for the two transitions that increased in prevalence whereas the duration of the gap for the transition that became less prevalent over time increased. (b). There was a significant negative relationship between age-dependent changes to transition probabilities and log10 gap durations (F1,108.4 = 5.3, p = 0.0230; slope = -0.063±0.027). (c). The magnitude of change (percent change) in gap durations varied depending on whether the prevalence of a transition within a branch point significantly decreased, did not significantly change, or significantly increased (Likelihood ratio test) over time. Also included in the analysis was the percent change in gap durations for transitions within stereotyped sequences (data from [34]). The magnitude of change in gap durations was significantly different between transitions that significantly decreased and transitions that significantly increased in transition probability over time (Tukey’s HSD, p<0.05) and nearly identical between stereotyped transitions and branch point transitions that did not change in probability over time.