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. 2011 Mar 9;6(3):e17460. doi: 10.1371/journal.pone.0017460

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Grimsley 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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With increasing pup age the proportion that had nonlinearities changed significantly (X² (5, N = 2416) = 1417, p<0.001); increasing steadily developmentally. There were also significant changes in the proportions of harmonic syllables (X² (5, N = 7672) = 1091, p<0.001). Adult mouse syllables were almost always tonal, the proportions of tonal syllables changed significantly over development (X² (5, N = 17915) = 1737, p<0.001).