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Individuals with schizophrenia show similar task performance but use different brain regions for auditory working memory. The visual word form area may compensate for auditory cortex dysfunction, especially in patients with hallucinations.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Psychiatry

Background:

  • Auditory working memory deficits are common in schizophrenia.
  • Neural dynamics underlying auditory working memory in schizophrenia are not well understood.
  • Investigating compensatory mechanisms is crucial for understanding schizophrenia.

Purpose of the Study:

  • To compare neural dynamics of auditory working memory between individuals with schizophrenia (SZ) and healthy comparison subjects (HC).
  • To explore the role of altered brain activity and potential compensatory mechanisms in schizophrenia.
  • To investigate the relationship between neural activity, task performance, and clinical symptoms.

Main Methods:

  • Magnetoencephalography (MEG) was used to measure induced high gamma power (iHGP) during a speech-sound working memory task.
  • Cortical activity was analyzed in both SZ and HC groups.
  • Correlations between neural activity, task performance, and clinical measures were examined.

Main Results:

  • SZ and HC groups exhibited similar task performance.
  • SZ individuals showed altered recruitment of brain regions compared to HC.
  • SZ patients recruited the visual word form area (VWFA) during encoding and response preparation, which correlated with hallucinations and working memory capacity.
  • SZ patients lacked the typical correlation between iHGP and performance in the posterior superior temporal gyrus (STGp).

Conclusions:

  • Schizophrenia involves altered neural dynamics during auditory working memory.
  • The visual word form area (VWFA) may be recruited as a compensatory mechanism for posterior superior temporal gyrus (STGp) dysfunction in schizophrenia.
  • VWFA plasticity is linked to symptom severity and working memory performance in individuals with schizophrenia and hallucinations.