Our past video recordings of how the squirrel monkey voice box works during vocalization now seem to support a hypothesis on the evolution of the human ability to speak." Nishimura concludes ...

To mimic a human lung, Sawada uses a compressed air tank which forces air into a plastic voice-box chamber, where it makes rubber “vocal cords” vibrate (see diagram). The basic sounds ...

The loss of small tissue structures from the voice box may have been essential for the evolution of human speech. In a study of 43 non-human primates, all the animals had “vocal membranes”, a ...