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  • Auditory sensitivity between 0.5-5.0 kHz for chimpanzees, humans and the early hominins. Points higher on the curve indicate greater auditory sensitivity. (A) Region of maximum sensitivity. The early hominins are shifted toward slightly higher frequencies compared with chimpanzees. (B) Hearing results. The early hominins show a distinct auditory pattern. They are more sensitive than either chimpanzees or humans up to around 3 kHz. Above around 3.5 kHz, the early hominins resemble chimpanzees more closely in showing a dropoff in sensitivity.
    Rolf Quam
    Auditory sensitivity between 0.5-5.0 kHz for chimpanzees, humans and the early hominins. Points higher on the curve indicate greater auditory sensitivity. (A) Region of maximum sensitivity. The early hominins are shifted toward slightly higher frequencies compared with chimpanzees. (B) Hearing results. The early hominins show a distinct auditory pattern. They are more sensitive than either chimpanzees or humans up to around 3 kHz. Above around 3.5 kHz, the early hominins resemble chimpanzees more closely in showing a dropoff in sensitivity.
  • Lateral view of the Paranthropus robustus skull SK 46 from the site of Swartkrans, South Africa showing the 3D virtual reconstruction of the ear and the hearing results for the early hominins.
    Rolf Quam
    Lateral view of the Paranthropus robustus skull SK 46 from the site of Swartkrans, South Africa showing the 3D virtual reconstruction of the ear and the hearing results for the early hominins.
  • Hearing results for the early hominins. Points higher on the curve indicate greater auditory sensitivity. Note the sharp dropoff in sensitivity above about 3 kHz.
    Rolf Quam
    Hearing results for the early hominins. Points higher on the curve indicate greater auditory sensitivity. Note the sharp dropoff in sensitivity above about 3 kHz.
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