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. 2015 Jul 1;10(7):e0130682. doi: 10.1371/journal.pone.0130682

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© 2015 Hattori et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Fig 3 — (a) Median inter-tap-intervals and (b) average of absolute variance of chimpanzees and human participants in ‘no stimulus’ condition. The figure shows the average (crossbar), the range from the 25^th to 75^th percentiles (shaded box), and the minimum and maximum values (thin line). (c) An example of time series of inter-tap-interval by Ai (chimpanzee) and H2 (human). Tapping data was taken from the 1^st trial of the ‘no stimulus’ condition.