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Australian psychologist Stanley Porteus (1883–1972) presents the findings of his research on students at Vineland Training School, an educational facility for people with developmental disabilities. He used intelligence tests and other investigatory methods to measure physical and mental abilities, then hypothesized about the students’ educational needs and professional prospects. Porteus, like many of his cohorts, believed that differences in intelligence testing results supported erroneous ideas about the inferiority of neurodivergent people, women, people of color, and other marginalized groups.

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