Handedness of capuchin monkeys.
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Left-handed schizophrenic patients showed lateral ventricular enlargement and generally poorer performance on intelligence and neuropsychological tests compared with right-handed schizophrenic patients. These results suggest that left-handed schizophrenic patients have more cerebral dysfunction than right-handed schizophrenic patients.
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A left-sided preponderance of psychogenic symptoms has often been reported. A Suggestion Test for the study of the laterality of psychogenic symptoms is described. Psychiatric patients and nurses received, on tape, the suggestion of a sensation in the hand to which they could give either right, left or bilateral responses. In both groups there was a majority of left-sided responses. Also, a history was obtained of previous psychogenic symptoms. These had occurred more on the left than on the right side of the body, and an association was found between left-sided symptoms and left-sided response to the test in individual patients. Left-sided symptoms were more prevalent among patients who were not strongly right-handed. These findings are considered in relation to ideas about the differential involvement of the cerebral hemispheres in the production of psychogenic symptoms.
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