Educability-and-Group-Differences-1973-by-Arthur-Robert-Jensen

Physical Environment and Mental Development 351
mance correlates substantially with conventional measures of IQ.
The white-Negro difference found by Amante et al. on the Bender
Gestalt, however, would be roughly equivalent to 11 IQ points,
which is slightly larger than the average difference typically found
for Negro and white children within the lower social strata.
It is interesting to see this conclusion of genetic mterclass and interracial
IQ differences appearing in a 1970 issue of Journal of Social
Issues, the official periodical of the Society for the Psychological
Study of Social Issues, the Council of which in 1969 publicly
censured me for drawing a similar conclusion in my article in the
Harvard Educational Review. My statement was: ‘The preponderance
of the evidence is, in my opinion, less consistent with a strictly
environmental hypothesis than with a genetic hypothesis, which, of
course, does not exclude the influence of environment or its interaction
with genetic factors’ (Jensen, 1969a, p. 82).
Nichols (1970, p. 65) found the mean absolute difference in 4-yearold
Stanford-Binet IQs between full sibs to be 11-82 for whites
{N — 1,100) and 11-97 for Negroes (N = 970). The white and Negro
mean Stanford-Binet IQs at age 4 differed by 13 points (p. 70) and
mean WISC IQs at 7 years of age differed about 10 points (p. 99)
in this sample.