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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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Durations of all labeled notes and silent gaps of undirected song. Left: Scatterplots of durations separated by note type and bird ID (x-axis). Gaps are categorized by the preceding note. Right: Histograms of all note and gap durations. The durations of all 5006 notes ranged from 26 to 256 ms (134 ± 60 ms; mean ± std). Of all gaps, 4456 were within song chunks and had durations between 6 and 288 ms (43 ± 23 ms; mean ± std). Of those, 305 were either considered outliers or were part of gap types that had a high mean duration and large variance (dark gray and light gray points, respectively). Excluding those, the remaining gap durations ranged from 6 to 88 ms (38 ± 12 ms; mean ± std).