RACE BRAIN SIZE AND INTELLIGENCE, (VOL 11, PG 785, 1990)

This paper presents two corrections to an earlier paper by Rushton (Pe rsonality and Individual Differences, 11, 785-794, 1990). The first is to the equation used to calculate cranial capacities from externally measured head sizes. Eleven millimeters should be subtracted from head length and width for fat and skin around the skull. When the subtract ions are made the cranial capacities for the different races are about 200 cm3 smaller than previously reported, although the significant ra nk ordering of Mongoloids > Caucasoids > Negroids is preserved. The se cond correction is to the statement that there are no sex differences in brain size when body size variables are controlled. Two recent stud ies using large data sets show that after covariance adjustment for bo dy size, women's brains average 100 g lighter and 110 cm3 smaller than men's. These findings are best understood from the perspective of hum an evolution.