Abnormal premovement brain potentials in schizophrenia

Jaswinder Singh, Robert T. Knight, N. Rosenlicht, Joan M. Kotun, D. J. Beckley, David L Woods

Research output: Contribution to journalArticlepeer-review

37 Scopus citations


We assessed scalp-recorded movement related potentials (MRPs) generated prior to voluntary movements in chronic, medicated schizophrenics (n = 9) and age matched normal controls (n = 9). MRPs were recorded in a self-paced button press task in which subjects pressed a button with either their right, left or both thumbs (experimental condition I, II and III respectively). Controls generated a slowly rising readiness potential (RP) at about 1000 ms, a negative shift (NS') at about 450 ms and a motor potential (MP) at about 100 ms prior to movement. The initial MRP components (RP and NS') were reduced in schizophrenics indicating an impairment of the voluntary preparatory process in schizophrenia. Results of the present study indicate a similarity of MRP findings in schizophrenics and reported MRPs (Singh and Knight, 1990) in patients with unilateral lesions of the dorsolateral prefrontal cortex. These findings provide further support for frontal lobe dysfunction in schizophrenia.

Original languageEnglish (US)
Pages (from-to)31-41
Number of pages11
JournalSchizophrenia Research
Issue number1
StatePublished - 1992


  • (Schizophrenia)
  • Frontal lobes
  • Movement-related potentials
  • Readiness potential
  • Schizophrenia
  • Voluntary movements

ASJC Scopus subject areas

  • Psychiatry and Mental health
  • Behavioral Neuroscience
  • Biological Psychiatry
  • Neurology
  • Psychology(all)


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