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Related Experiment Video

Updated: Feb 20, 2026

Investigating the Effects of Antipsychotics and Schizotypy on the N400 Using Event-Related Potentials and Semantic Categorization
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Reduced auditory segmentation potentials in first-episode schizophrenia.

Brian A Coffman1, Sarah M Haigh1, Timothy K Murphy1

  • 1Clinical Neurophysiology Research Laboratory, Western Psychiatric Institute & Clinic, Department of Psychiatry, University of Pittsburgh School of Medicine, United States.

Schizophrenia Research
|October 27, 2017
PubMed
Summary
This summary is machine-generated.

Auditory segmentation potential (ASP) deficits, crucial for auditory scene analysis, are present in first-episode psychosis schizophrenia. This suggests ASP may be an early biomarker for schizophrenia-related brain dysfunction.

Keywords:
AuditoryEEGMidcingulateN2PerceptionSustained potential

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Auditory Perception

Background:

  • Auditory scene analysis (ASA) dysfunction is a key feature of schizophrenia.
  • Auditory object segmentation, assessed via auditory segmentation potential (ASP), and auditory edge detection (N2 modulation) are impaired in chronic schizophrenia.

Purpose of the Study:

  • To investigate if ASP and N2 modulation deficits are present in the early stages of schizophrenia spectrum disorders.
  • To explore the neural sources of ASP and their dysfunction in first-episode psychosis (FE).

Main Methods:

  • Compared ASP and N2 modulation in individuals with first-episode psychosis (N=20) and healthy controls (N=24) using electroencephalography.
  • Utilized structural MRIs to localize ASP sources in a subset of participants (N=14 per group).

Main Results:

  • First-episode psychosis (FE) showed a significant reduction (>40%) in ASP compared to healthy controls.
  • N2 modulation did not differ significantly between FE and healthy controls.
  • ASP sources were localized to midcingulate cortex (MCC) and temporal auditory cortex, with reduced neurophysiological activity in FE's MCC.

Conclusions:

  • Auditory segmentation (ASP) deficits are evident early in schizophrenia, while auditory edge detection (N2 modulation) appears relatively preserved.
  • Reduced MCC activity in FE, linked to ASP, suggests potential as an early index of schizophrenia-related dysfunction.
  • ASP deficits may serve as a valuable biomarker for detecting schizophrenia presence early in its course.