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. 2016 Jul 6;10:309. doi: 10.3389/fnins.2016.00309

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Copyright © 2016 Norton and Scharff.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Frequencies of the best fitting pulses^S for all analyzed chunks of undirected (left in each box) and directed song (right, e.g., “4042dir”) for 9 birds. Circles indicate frequency clusters as determined by hierarchical clustering analysis. Circle size corresponds to the percentage of chunks in the cluster relative to all chunks from the respective bird and condition. The cluster containing the most chunks for each bird and condition is black and the percentage of chunks in that cluster is given. Mean frequency of those clusters is shown on top of the figure.