Cited by 3Schizophrenia research and treatmentNeural dynamics and brain functionNeuroscience and Neuropharmacology Research

Restoring synaptic balance in schizophrenia: Insights from a thalamo-cortical conductance-based model

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Berndt, Lioba C S, Singh, Krish D, Shaw, Alexander D·2026·Schizophrenia Bulletin

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Abstract

BACKGROUND AND HYPOTHESIS: The dysconnectivity hypothesis of schizophrenia suggests that atypical neural communication underlies the disorder's diverse symptoms. Building on this framework, we propose that specific synaptic disturbances within thalamo-cortical circuits contribute to an imbalance in excitation and inhibition, leading to alteration in oscillations. Our study investigates these alterations and explores whether synaptic restoration can remediate neural activity of schizophrenia and align it with healthy patterns. STUDY DESIGN: We analyzed magnetoencephalography data from schizophrenia patients and healthy controls using dynamic causal modeling to identify synaptic differences in thalamo-cortical circuits. The analysis focused on N-methyl-D-aspartate (NMDA), α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA), gamma-aminobutyric acid type A (GABA-A), and gamma-aminobutyric acid type B (GABA-B) receptor-mediated connections. In silico synaptic restoration analysis simulated the effects of targeted adjustments to these receptor-mediated connections to assess whether altered neural activity in schizophrenia could be restored to match control patterns. STUDY RESULTS: Schizophrenia patients showed statistically significant differences in increased NMDA receptor excitation in superficial pyramidal neurons and reduced GABA-B receptor inhibition between interneurons and pyramidal cells. Parameter recovery analysis revealed limitations for these specific parameters, suggesting that receptor-level interpretations should be made with caution. The in silico synaptic restoration analysis indicated that coordinated modifications across multiple synaptic pathways could potentially remediate neural activity to resemble healthy controls. CONCLUSIONS: This restoration approach suggests the complex nature of synaptic dysfunction in schizophrenia may involve coordinated changes across multiple synaptic parameters rather than isolated alterations. While our findings provide preliminary evidence extending the dysconnectivity theory of schizophrenia, the parameter recovery limitations suggest that specific receptor claims should be interpreted with caution.

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  • NMDA receptor dysfunction, which is implicated in schizophrenia, affects synaptic gain and thus the encoding of prediction error signals.

    “NMDA receptor dysfunction, which is implicated in schizophrenia, affects synaptic gain and thus the encoding of prediction error signals (26).”

    From Predictive coding and neurocomputational psychiatry: a mechanistic framework for understanding mental disorders (2026) · cites this paper as [26]

    The Introduction (page not provided) implicates NMDA receptor dysfunction in schizophrenia, and Discussion §4.2 reports altered NMDA-mediated excitation in superficial pyramidal cells. The paper does not connect that alteration to the encoding of prediction error signals, so the claimed consequence is unsupported. (LLM, conf=0.84)

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  • Computational psychiatry studies have used conductance-based neural mass models to infer synaptic changes in disorders like schizophrenia from M/EEG recordings.

    “Computational psychiatry studies have done exactly this – for instance, using conductance-based neural mass models to infer synaptic changes in disorders like schizophrenia from M/EEG recordings (25, 26).”

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  1. [30]Robinson S, Vrba J, Yoshimoto T, et al. Recent Advances in Biomagnetism. Sendai: Tohoku University Press; 1999.

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Authors
Berndt, L. C. S., Singh, K. D., & Shaw, A. D.
Affiliations
  • University of Exeter (GB)
  • Cardiff University (GB)
Corresponding author
Berndt, Lioba C S
Venue
Schizophrenia Bulletin
Published
2025-09-11
Volume
52
Issue
4
ISSN
  • 0586-7614 (ISSN-L)
  • 1745-1701
OpenAlex
W4414152921
Cited by
3
References
97
Citations by year
2026: 2 · 2025: 1
FWCI
2.01
Type
journal article
Language
en
Open access
Locations
  • Schizophrenia Bulletin (publishedVersion, cc-by)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by)
  • PubMed (publishedVersion)
  • PubMed Central (publishedVersion, cc-by)
  • ORCA Online Research @Cardiff (Cardiff University) (acceptedVersion)
Funders
Schools of Psychology and Medicine at Cardiff University and the School of Psychology at University of Exeter (MRC/EPSRC, MR/K005464/1, 226709/Z/22/Z)
Topics
  • Health Sciences › Medicine › Psychiatry and Mental health › Schizophrenia research and treatment
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural dynamics and brain function
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
schizophrenia, thalamocortical circuits
MeSH terms
Adult, Cerebral Cortex, Female, Humans, Male, Middle Aged, Models, Neurological, Nerve Net, Neural Pathways, Schizophrenia, Synapses, Thalamus, Magnetoencephalography, Receptors, N-Methyl-D-Aspartate, Receptors, GABA-B

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