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Schizophrenia is characterized by significant problems in control of behavior; however, the disturbances in neural systems that control movement remain poorly characterized. We used functional magnetic resonance imaging (fMRI) to evaluate the origin of motor overflow in schizophrenia. Twenty-seven clinically stable medicated outpatients with Diagnostic and Statistical Manual, 4th edition, text revision...
Action plans internally generated (IG) from memory are thought to be regulated by the supplementary motor area (SMA), whereas plans externally guided (EG) online using sensory cues are believed to be controlled by the premotor cortex. This theory was investigated in an event-related fMRI study that separated the time course of activation before and during movement to distinguish advance planning from...
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