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. Author manuscript; available in PMC: 2015 Oct 1.
Published in final edited form as: Trends Cogn Sci. 2014 Jul 18;18(10):543–553. doi: 10.1016/j.tics.2014.06.004

Figure 3.

Figure 3

Hypothetical transition from an ancestral unisensory, acoustic-only vocal rhythm to the one that is audiovisual, with both mouth movements and acoustics sharing the same rhythmicity. A. Schematic of a presumptive ancestral vocalization with rhythmic auditory component (blue line) and non-rhythmic visual component (red line). B. Graphical representation of a presumptive ancestral rhythmic facial expression without any vocal component. Convention as in A. C. Illustration of a speech-like utterance with rhythmic and coupled audiovisual components.