Loss of air sacs improved hominin speech abilities.

@article{Boer2012LossOA,
  title={Loss of air sacs improved hominin speech abilities.},
  author={Bart M. de Boer},
  journal={Journal of human evolution},
  year={2012},
  volume={62 1},
  pages={1-6}
}
In this paper, the acoustic-perceptual effects of air sacs are investigated. Using an adaptive hearing experiment, it is shown that air sacs reduce the perceptual effect of vowel-like articulations. Air sacs are a feature of the vocal tract of all great apes, except humans. Because the presence or absence of air sacs is correlated with the anatomy of the hyoid bone, a probable minimum and maximum date of the loss of air sacs can be estimated from fossil hyoid bones. Australopithecus afarensis… CONTINUE READING
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