Table 3 Occupied band and sound power transmission values from 0.5 to 5.0 kHz.

Negative values are in parentheses. Values in bold are means ± SD.

Occupied bandSound power at the entrance to the cochlea (SPC)*
LowerUpperSPC atSPC atSPC atSPC atSPC atSPC atSPC atSPC atSPC atSPC at
limitlimitBandwidth500 Hz1000 Hz1500 Hz2000 Hz2500 Hz3000 Hz3500 Hz4000 Hz4500 Hz5000 Hz
Speciesn(Hz)(Hz)(Hz)(db)(db)(db)(db)(db)(db)(db)(db)(db)(db)
Australopithecus africanus (STW 98)1760339026303.113.79.111.113.514.67.0−2.6−13.3−20.5
Australopithecus africanus (STS 25)1715331026303.314.59.111.212.611.26.70.7−5.4−12.3
Paranthropus robustus1830341025802.213.49.611.713.914.48.0−2.4−16.9−6.5
Pooled early hominins mean ± SD3768 ± 583370 ± 532602 ± 262.9± 0.613.9 ± 0.69.3 ± 0.311.3 ± 0.413.3 ± 0.713.4 ± 1.97.2 ± 0.7(1.4) ± 1.9(11.8) ± 5.9(13.1) ± 7.0
Pooled early hominins range715–8303310–34102580–26302.2–3.313.4–14.59.1–9.611.1–11.712.6–13.911.2–14.66.7–8.0(−2.6)–0.7(−16.9)–(−5.4)(−20.5)–(−6.5)
Pan troglodytes mean ± SD11570 ± 543015 ± 1222445 ± 1343.8 ± 1.212.9 ± 1.37.1 ± 0.88.4 ± 1.18.2 ± 1.65.9 ± 1.30.2 ± 2.6(7.0) ± 4.8(10.5) ± 5.3(10.7) ± 6.1
Pan troglodytes range490–6502750–32052185–26351.6–5.810.5–14.45.8–8.96.9–10.15.9–11.23.2–7.4(−3.2)–3.6(−16.6)–(−2.2)(−22.7)–(−3.6)(−17.5)–(−0.6)
Atapuerca (SH) mean ± SD5791 ± 933969 ± 1663178 ± 2130.8 ± 0.911.7 ± 1.27.9 ± 0.29.0 ± 0.88.8 ± 1.88.6 ± 2.98.3 ± 2.56.4 ± 2.01.1 ± 1.6(−5.2) ± 2.2
Atapuerca (SH) range715–9303760–41552830–3365(−0.2)–1.99.7–13.07.6–8.07.9–10.26.5–11.55.3–12.95.3–11.14.8–9.8(−1.1)–2.8(−8.5)–(−3.0)
Homo sapiens mean ± SD10841 ± 954339 ± 3323498 ± 3490.8 ± 1.710.3 ± 1.88.0 ± 0.49.0 ± 0.79.1 ± 1.18.7 ± 1.58.5 ± 1.88.0 ± 1.85.1 ± 3.2(0.9) ± 5.2
Homo sapiens range720–10653870–49503035–4230(−3.8)–2.15.5–11.87.4–8.57.8–9.96.9–10.55.7–10.44.9–10.55.3–10.4(−1.2)–10.7(−11.5)–4.6

*Sound power at the entrance to the cochlea relative to P0 = 10−18 W for an incident plane wave intensity of 10−12 W/m2.