Science Advances

Supplementary Materials

This PDF file includes:

  • Comparative sample composition
  • Preservation of early hominin specimens
  • CT scanning of modern human, chimpanzee, and fossil hominin specimens
  • Model description
  • Comparison of present measurements with previous studies
  • Fig. S1. Virtual (3D CT) reconstruction of the outer, middle, and inner ears in P. robustus (SK 46).
  • Fig. S2. Model results for the effects of intraindividual measurement error on the sound power transmission in two reconstructions of the CSJ 26 H. sapiens individual.
  • Fig. S3. Model results for the effects of interindividual measurement error on the sound power transmission in two reconstructions of the HTB 3434 P. troglodytes individual.
  • Fig. S4. Block diagram of the analog electrical circuit model based on (30).
  • Fig. S5. Model results for sound power transmission in chimpanzees.
  • Fig. S6. Model results for sound power transmission in modern humans.
  • Fig. S7. Model results for sound power transmission in the early hominins.
  • Fig. S8. Model results for sound power transmission in the Middle Pleistocene Atapuerca (SH).
  • Fig. S9. Model results for the magnitude of the middle ear gain (|GME|) in modern humans.
  • Fig. S10. Model results for the magnitude of the middle ear gain (|GME|) in chimpanzees.
  • Fig. S11. Model results for the magnitude of the middle ear gain (|GME|) in early hominins.
  • Fig. S12. Model results for the magnitude of the middle ear gain (|GME|) in the Atapuerca (SH) specimens.
  • Table S1. Measurements and model results for the influence of intraindividual measurement error.
  • Table S2. Measurements and model results for the influence of interindividual measurement error.
  • Table S3. Definition of the electrical parameters, their related anatomical variables, the source of the value used, and the sensitivity analysis for frequencies above 2 kHz in the model.
  • Table S4. Measurements in the present study compared with those reported previously.
  • References (69–112)

Download PDF

Files in this Data Supplement: