In his 1916 book, The Measurement of Intelligence, Lewis Terman presented the first version of the Stanford-Binet scale and his testing results for groups of California children. Singling out a few children whose scores fell in the range he categorized as “feeble-minded,” Terman commented:
[They] represent the level of intelligence that is very, very common among Spanish-Indian and Mexican families of the Southwest and also among negroes. Their dullness seems to be racial or at least inherent in the family stocks from which they came. The fact that one meets this type with such extraordinary frequency among Indians, Mexicans, and negroes suggests quite forcibly that the whole question of racial differences in mental traits will have to be taken up anew and by experimental methods.1
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