Lewis M. Terman,
The measurement of intelligence
“ This is highly important in the diagnosis of the upper range of mental defectiveness. The criterion of the subnormal’s fitness for life outside an institution is his ability to understand social relations and to adjust himself to them. Failure of a subnormal to meet this criterion may lead him to break common conventions, and to appear disrespectful, sulky, stubborn, or in some other way queer and exceptional. He is likely to be misunderstood, because he so easily misunderstands others. The skein of human motives is too complex for his limited intelligence to untangle. ”
