Neurologic abnormalities in patients with schizophrenia have been called "soft signs" because they do not necessarily correspond to one type of psychotic disorder or to specific brain locations. Further, such findings could stem from antipsychotic medications or long-term illness. Keshavan et al. (p.
1298) studied neurologic abnormalities in patients with first-episode schizophrenia, healthy subjects, and patients with other psychotic disorders. The only tasks differentiating the schizophrenia patients from the other psychotic patients and the healthy subjects engaged cognitive functions and perception—memory, audiovisual integration, and recognition of face and hand stimuli. Among the schizophrenia patients but not the other groups, cognitive-perceptual performance correlated with volume of the cerebellum and left heteromodal association cortex, a composite reflecting a network of structures showing abnormalities in schizophrenia. If cognitive-perceptual soft signs are specific to schizophrenia and certain neuroanatomical locations, they may be useful as an inexpensive, quick part of neuropsychiatric assessments.
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