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  • Title: Tardive dyskinesia: neuropsychological, computerized tomographic, and psychiatric symptom findings.
    Author: Gold JM, Egan MF, Kirch DG, Goldberg TE, Daniel DG, Bigelow LB, Wyatt RJ.
    Journal: Biol Psychiatry; 1991 Sep 15; 30(6):587-99. PubMed ID: 1681948.
    Abstract:
    Prior studies have suggested that schizophrenic patients with tardive dyskinesia (TD) have an unusual incidence of cognitive impairment, structural brain abnormalities, and negative symptoms. Twenty-seven schizophrenic patients with TD and an equal number of age-, gender-, and education-matched schizophrenic controls were studied. Each patient received neuropsychological testing, psychiatric symptom ratings, and most had cerebral computed tomography (CT) scans. Patients with TD significantly differed from controls on only 1 of 23, cognitive measures, and the overall group performance profiles were highly similar. No differences were observed on symptom ratings. Patients with TD had significantly smaller ventricular-brain ratios (VBRs) than controls. These data fail to support an association of TD with global measures of "organicity." Abnormal movements may result from specific dysfunction within the more purely motor circuits of the basal ganglia without compromising other neural systems involved in cognitive processing.
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