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Ivison, David – Psychological Test Bulletin, 1990
Raven's Progressive Matrices and the Simpson Adult Vocabulary Scale were administered to 400 Australian hospitalized adults without psychiatric or neurological impairment in 4 age groups from 30 to 69 years. Compared to pre-1964 data, the subjects did not show gains in intelligence quotient as did younger age groups. (SLD)
Descriptors: Adults (30 to 45), Age Groups, Comparative Testing, Foreign Countries
