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ERP abnormalities during semantic processing in schizophrenia

J Adams1, S F Faux, P G Nestor

  • 1Department of Psychiatry, Harvard Medical School, Brockton, MA.

Schizophrenia Research
|October 1, 1993
PubMed
Summary
This summary is machine-generated.

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Schizophrenic patients show altered brain responses to semantic errors, indicated by reduced N400 amplitude and delayed latency. These neurophysiological changes suggest significant attentional process disturbances in schizophrenia.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Psychiatry

Background:

  • Thought disturbance is a key symptom in schizophrenia.
  • Event-related potentials (ERPs) like the N400 offer insights into cognitive processing.
  • Previous research noted auditory P300 disturbances in schizophrenic patients.

Purpose of the Study:

  • To investigate the neurophysiological and cognitive underpinnings of thought disturbance in schizophrenia.
  • To examine the N400 event-related potential (ERP) in response to semantic incongruity in schizophrenic patients.
  • To compare N400 amplitude, latency, and topography between schizophrenic patients and healthy controls.

Main Methods:

  • Visual presentation of sentences with semantically correct or incorrect endings.

Related Experiment Videos

  • Recording of event-related brain potentials (ERPs) using 28 electrode sites.
  • Analysis of N400 amplitude, latency, and topographical distribution.

    • Main Results:

    • Schizophrenic patients exhibited significantly reduced N400 amplitude and increased latency to semantically anomalous sentence endings compared to controls.
    • A late positive component following the N400 was also significantly reduced in amplitude in schizophrenic patients.
    • No significant differences in N400 or late positive potential topography were found between groups.

    Conclusions:

    • Findings suggest a profound disturbance in attentional processes in chronic schizophrenia, reflected in altered semantic processing.
    • The lack of topographical asymmetry in N400 contrasts with known P300 disturbances in schizophrenia.
    • N400 ERP measures provide valuable neurophysiological markers for understanding cognitive deficits in schizophrenia.