title: Bereitschaftpotential in schizophrenia.
abstract: BACKGROUND
  Several reports have documented the presence of motor abnormalities in schizophrenic patients.
  
  
  METHODS
  Thirty schizophrenics and 28 healthy controls were included in the study. Scalp-recorded bereitschaftpotentials (BPs) generated prior to voluntary movements were recorded in all subjects.
  
  
  RESULTS
  The early (NSI) and late components of BP and peak negativity were reduced in all schizophrenic patients. In particular, the NSI was reduced in patients with positive symptoms, and the late component in patients with negative symptoms.
  
  
  CONCLUSIONS
  These findings provide further support of the involvement of frontal cortex, subcortical structures and their connections in schizophrenia, and highlight some differences between positive and negative symptom clusters.
authors.affiliation: University Medical Faculty, Antalya, Turkey.
authors.forename: T
authors.initials: T
authors.lastname: Karaman
authors.forename: S
authors.initials: S
authors.lastname: Ozkaynak
authors.forename: K
authors.initials: K
authors.lastname: Yaltkaya
authors.forename: C
authors.initials: C
authors.lastname: Büyükberker
mesh_terms: D000328:Adult; D003265:Contingent Negative Variation / Q000502:physiology*; D004576:Electromyography; D005260:Female; D006801:Humans; D008297:Male; D011596:Psychomotor Disorders / Q000209:etiology* / Q000503:physiopathology; D012559:Schizophrenia / Q000150:complications / Q000503:physiopathology*