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

Figure 2. Spectrograms of the different syllable types produced by CBA/CaJ mice.

Figure 2

The majority of syllables have energy solely in the ultrasonic range (20 kHz) with the exception of the Noisy syllable and the low frequency harmonic (LFH) syllable. Note substantial energy at frequencies above 100 kHz for many syllables. Tonal syllables are marked (A); these syllables have no harmonics or nonlinearities. Harmonic sounds are marked with a (B). Nonlinear sounds are marked with a (C); these syllables have subharmonics or deterministic chaotic elements.