Walkie-talkie evolution: Bipedalism and vocal production

Behavioral and Brain Sciences 27 (4):520-521 (2004)
A converging pattern of evidence from laughter, tickling, and motherese suggests that bipedal locomotion plays a critical and unanticipated role in vocal evolution. Bipedalism frees the thorax of its support role during quadrupedal locomotion, which permits the uncoupling of breathing and striding necessary for the subsequent selection for vocal virtuosity and speech.
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