Recurrent abdominal pain in children and associated DSM-III diagnosis.
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The M Test, a brief test for measuring malingering of schizophrenic illness, contains true-false items describing actual symptoms of schizophrenia, bizarre attitudes and beliefs, and fake symptoms. Normal subjects rarely endorsed any of the items. The responses of genuinely ill schizophrenic inpatients were compared with those of normal subjects who had been asked to fake malingering after being educated about the symptoms of schizophrenia and forewarned about the purpose of the test. The test significantly discriminated between genuinely ill patients and malingerers. The test correctly identified 87.3% of the schizophrenic subjects and 78.2% of the malingering normal subjects.
Criteria for hysterical psychosis set forth by Hollender and Hirsch were systematically applied to a representative sample of 217 patients hospitalized for the first time in their lives for functional psychiatric illness. Surprisingly, no patients who met all of these criteria were found.
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This paper reviews the use of a modern psychophysical technique known as symptom validity testing. The technique employs a forced choice procedure providing an objective method for distinguishing between functional and organic aetiology in cases with sensory or memory deficit. The determination of functionality is by the objective demonstration that behaviour is controlled by stimuli in the sense modality in which the deficit is claimed. The data can be evaluated using conventional statistical techniques. The method is an advance on classical psychophysical methods as it does not depend upon the patient reporting whether he can or cannot perceive a single stimulus.