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. 2013 Apr 7;280(1756):20122639. doi: 10.1098/rspb.2012.2639

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© 2013 The Author(s) Published by the Royal Society. All rights reserved.

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Figure 3. — Comparing vocalizations with fictive activity from the X. boumbaensis isolated brain. (a) Waveform of the X. boumbaensis advertisement call: single clicks of sound repeated at approximately 117 ms intervals. (b) Enlarged waveform of a single click; compare this single click with nerve activity in part (d) at the same time scale. (c) X. boumbaensis nerve activity is composed of bursts of CAPs separated by longer inter-burst intervals. (d) Bursts consist of one, two or three CAPs. Quadruplets (not shown) were rare. (e) The mean inter-burst interval recorded from the X. boumbaensis laryngeal nerve in the isolated brain was not significantly different from inter-click intervals from vocal recordings. Each point represents an individual mean. Horizontal lines represent group means, and error bars represent s.e.m. (f) The majority (65%) of all recorded bursts were doublets. (g) Frequency distribution of inter-CAP intervals within all bursts (intra-burst interval) reveals intervals of less than 20 ms (mean 14.4 ± 2.4 (s.d.) ms), which have no behavioural correlate.