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Related Experiment Videos

Aberrant semantic activation in schizophrenia: a neurophysiological study

P G Nestor1, M O Kimble, B F O'Donnell

  • 1Department of Psychiatry, Harvard Medical School, Boston, MA, USA.

The American Journal of Psychiatry
|May 1, 1997
PubMed
Summary

Schizophrenia patients exhibit slower semantic processing, indicated by prolonged N400 brain potentials. This suggests a difficulty in maintaining and utilizing semantic context, impacting language comprehension in schizophrenia.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Psychiatry

Background:

  • Schizophrenia is often associated with disruptions in semantic associations.
  • These semantic disturbances are hypothesized to have neurobiological underpinnings.

Purpose of the Study:

  • To investigate the neurophysiological characteristics of semantic processing in individuals with schizophrenia.
  • To examine event-related brain potentials associated with semantic context.

Main Methods:

  • Electroencephalography (EEG) was used to record brain activity.
  • Participants (15 schizophrenic patients, 15 controls) read sentences with sensible or nonsensical endings.
  • The N400 component, a measure of semantic expectancy, was analyzed.

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Main Results:

  • Schizophrenic patients showed delayed N400 latency following nonsensical sentence endings.
  • Patients with schizophrenia exhibited increased N400 negativity irrespective of sentence ending coherence.
  • These findings indicate altered neurophysiological responses to semantic context in schizophrenia.

Conclusions:

  • Schizophrenia is linked to slower and more widespread semantic activation.
  • This may reflect a disease-related impairment in maintaining and applying semantic context.
  • Neurophysiological evidence supports fundamental disturbances in semantic processing in schizophrenia.