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Brain Structural and Functional Alteration Network Localization of Visual Hallucinations.

Yifan Li^1,2,3,4, Fan Mo^1,2,3,4, Chenglong Liu^1,2,3,4

¹Department of Radiology, The First Affiliated Hospital of Anhui Medical University, No. 218, Jixi Road, Shushan District, Hefei 230022, China.

Schizophrenia Bulletin

|September 19, 2025

Summary

This summary is machine-generated.

Visual hallucinations (VH) involve widespread brain networks, specifically the frontoparietal and attention networks. Understanding these brain network alterations offers potential for improved VH treatments.

Keywords:

brain network functional connectivity magnetic resonance imaging structure and function visual hallucinations

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Area of Science:

Neuroscience
Neuroimaging
Psychiatry

Background:

Visual hallucinations (VH) are a significant symptom in neurodegenerative and psychiatric disorders, often indicating a worse prognosis.
Current understanding suggests VH involves interconnected brain networks rather than isolated regions.
Limited research exists on the specific brain network localization of VH.

Purpose of the Study:

To identify and map the specific brain networks associated with visual hallucinations.
To provide a network-based neurobiological understanding of VH.
To explore potential therapeutic targets for VH.

Main Methods:

Systematically reviewed 21 neuroimaging studies to identify structural and functional alterations in 418 individuals with VH.
Applied functional connectivity network mapping to large resting-state fMRI datasets (discovery n=1113, validation n=1093).
Mapped identified brain alterations to specific functional brain networks.

Main Results:

Structural alterations in VH were primarily linked to the frontoparietal and dorsal attention networks.
Functional alterations in VH predominantly involved the ventral attention and frontoparietal networks.
Both structural and functional alterations were distributed across widespread brain regions within these networks.

Conclusions:

VH is associated with alterations in specific, interconnected brain networks, notably the frontoparietal and attention networks.
This network-level understanding refines the neurobiology of VH.
Findings may guide the development of more targeted treatments for visual hallucinations.