Abstract
Recent studies have shown that even after correcting for body size, significant sex and race differences exist in brain size whether estimated from weight at autopsy, from endocranial volume, or from external head measurements. In this study, cranial capacities are calculated from external head measurements reported for 40 samples from a 1990 review of ergonomically important body measurements compiled by the International Labour Office in Geneva. The measurements had been gathered over the previous 30 years from tens of thousands of men and women aged 25 to 45 years. After adjusting for the effects of stature and race, 14 male samples averaged 1,362 cm 3 and 14 female samples averaged 1,201 cm 3. After adjusting for the effects of stature and sex, 6 East Asian samples averaged 1,308 cm 3, 18 European samples averaged 1,297 cm 3, and 4 African samples averaged 1,241 cm 3.
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