Table 1 Adult age predicts vocal diversity. Results from Bayesian generalized linear models assessing the explanatory power of FoxP2 MMSt/VSP expression ratio (mean centered), adult age, and their interaction, in predicting each of the three vocal learning measures computed for audio-recording block 5. Negative estimates for effect sizes for Age indicate lower values for the older adult age class

From: Persistent vocal learning in an aging open-ended learner reflected in neural FoxP2 expression