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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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Sonograms of one song chunk from bird 4042. Pulses^S are the one best fitting on note onsets (18.3 Hz, black box) as well as integer fractions and multiples of that frequency. Triangles indicate gesture transitions that either coincide with the respective pulse (white) or do not (gray, see Section Materials and Methods for details).