The jaw movements of speech are most probably derived from jaw movements associated with vocalisation. Cyclicity does not argue strongly for derivation from a cyclic pattern, because it arises readily in any system with feedback control. The appearance of regular repetition as a part of ritualisation of a display may have been important.
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ANDREW R. J., 1963, BEHAVIOUR, V20, P1, DOI 10.1163/156853963X00220