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Individuals with first-episode schizophrenia (FES) exhibit memory deficits impacting pattern separation and completion. Antipsychotic treatment normalized dentate gyrus activity, suggesting improved hippocampal function and reduced delusion severity.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Psychiatry

Background:

  • The hippocampus, particularly the dentate gyrus (DG) and CA3 subfields, is crucial for pattern separation and completion, respectively.
  • Schizophrenia is linked to hippocampal abnormalities, potentially impairing these memory functions.
  • Deficits in pattern separation and completion may contribute to delusions in schizophrenia.

Purpose of the Study:

  • To investigate memory deficits in first-episode schizophrenia (FES) and their relationship with delusions.
  • To examine the neural underpinnings of these deficits using high-resolution fMRI.
  • To assess the impact of antipsychotic treatment on hippocampal function and memory performance in FES.

Main Methods:

  • A case-control study involving 45 individuals with FES and 49 healthy controls (HC).
  • High-resolution fMRI was used to measure behavioral and neural responses during mnemonic discrimination and recognition memory tasks.
  • Participants were assessed at baseline (medication-naïve or minimally treated) and after antipsychotic treatment.

Main Results:

  • Individuals with FES showed deficits in recognition memory and pattern separation, with poorer memory performance correlating with delusion severity.
  • Neural analyses revealed reduced hippocampal BOLD responses during mnemonic discrimination in FES compared to HC.
  • Antipsychotic treatment normalized DG activity during pattern separation, and cortical activity predicted performance.

Conclusions:

  • First-episode schizophrenia is associated with impaired hippocampal-dependent memory systems, contributing to cognitive deficits and delusions.
  • Antipsychotic treatment can improve hippocampal circuit functioning, specifically normalizing DG activity during pattern separation.
  • Compensatory cortical mechanisms may play a role in maintaining performance in FES.