Fig. 5
From: Persistent vocal learning in an aging open-ended learner reflected in neural FoxP2 expression
Sample of changes in older adult acoustic space. Acoustic trait space of 3 older adult budgerigars, where each point represents a single call characterized by seventeen standard acoustic features and projected into two-dimensional space using the t-SNE dimensionality reduction approach. Acoustically similar calls appear closer together in this trait space defined by the dimensions TSNE1 and TSNE2. Calls produced by individual 1 in recording block 1 (a) vs. block 5 (b), individual 2 in recording block 1 (c) vs. block 5 (d), and individual 3 in recording block 1 (e) vs. block 5 (f)