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May 16 2013
Our australopith ancestors heard their world differently from modern humans.
Rolf Quam at Binghamton University in New York State and colleagues have discovered rare middle ear bones from two extinct southern African hominins – Australopithecus africanus and Paranthropus robustus.
A combination of ape-like and human-like features in the bones indicate some australopiths lacked sensitivity to the midrange frequencies that modern humans use for speech.
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