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Abstract Reasoning1
Mental Disorders1
Narcotics1
Psychological Testing1
Schizophrenia1
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J Psychol1
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Sheppard, Charles1
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Raven Progressive Matrices1
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Further Study of Performance Errors on Ravens Progressive Matrices.
Sheppard, Charles; and others – J Psychol, 1969
Descriptors: Abstract Reasoning, Mental Disorders, Narcotics, Psychological Testing