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Experimental studies by O'Connor (2) and O'Connor and Rawnsley (3) have indicated the value of separating chronic schizophrenics into those who exhibit and those who do not exhibit paranoid symptoms. Other work by O'Connor and Venables (4) and Venables and O'Connor (6) has shown that performance of schizophrenic patients on experimental laboratory tasks may be clarified by dividing them into active or withdrawn groups by means of a rating scale (Venables, 5) in addition to a division on the basis of the presence of paranoid symptoms.
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Venables et al. (1959) studied this question.
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