Washington D.C. – A pivotal 1965 study conducted at the Lorton Youth Center, known as the "Lorton study," revealed significant discrepancies in intelligence assessment and demonstrated substantial academic growth among incarcerated individuals, playing a crucial role in a 1967 federal court decision against ability grouping in public schools. The study, cited by a district judge, highlighted the potential for educational advancement among "disadvantaged" students, challenging prevailing notions of fixed intelligence.
The research, focusing on 69 inmates aged 18 to 26—predominantly African American high school dropouts from the District of Columbia—compared results from verbal and non-verbal aptitude tests. Findings showed an average IQ score of 78 on the verbal Otis test, contrasting sharply with an average of 98 on the non-verbal Revised Beta Examination, a 20-point difference. For a subset of 24 inmates who scored 75 or below on the Otis test, their average Beta score was 91, a 29-point increase, suggesting that verbal tests underestimated their true intellectual capacity.
Furthermore, with a year of instruction, these inmates made remarkable academic progress. Their average reading level improved by 1.3 years, moving from a 6.9 grade level to an 8.2 grade level. In arithmetic, the average gain was even more pronounced, increasing by 1.8 years from a 5.6 grade level to a 7.4 grade level. Even the 24 inmates initially identified as "low-scoring" on the verbal test achieved similar gains.
The district judge in the landmark 1967 Hobson v. Hansen case utilized these findings as key evidence. The court concluded that the "Lorton study" demonstrated that "a disadvantaged Negro student with a supposedly low IQ can, given the opportunity, far surpass what might be expected of a truly `subnormal' student." This evidence was instrumental in the court's decision to abolish the "track system" (ability grouping) in D.C. public schools, arguing that such systems, based on potentially flawed assessments, denied equal educational opportunities. The study underscored the view that perceived academic limitations were often a reflection of environmental factors and biased testing rather than inherent ability.
