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Not on speaking terms: hallucinations and structural network disconnectivity in schizophrenia

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Abstract

Auditory verbal hallucinations (AVH) in schizophrenia have previously been associated with functional deficiencies in language networks, specifically with functional disconnectivity in fronto-temporal connections in the left hemisphere and in interhemispheric connections between frontal regions. Here, we investigate whether AVH are accompanied by white matter abnormalities in tracts connecting the frontal, parietal and temporal lobes, also engaged during language tasks. We combined diffusion tensor imaging with tract-based spatial statistics and found white matter abnormalities in patients with schizophrenia as compared with healthy controls. The patients showed reduced fractional anisotropy bilaterally: in the anterior thalamic radiation (ATR), body of the corpus callosum (forceps minor), cingulum, temporal part of the superior longitudinal fasciculus (SLF) and a small area in the inferior fronto-occipital fasciculus (IFOF); and in the right hemisphere: in the visual cortex, forceps major, body of the corpus callosum (posterior parts) and inferior parietal cortex. Compared to patients without current hallucinations, patients with hallucinations revealed decreased fractional anisotropy in the left IFOF, uncinate fasciculus, arcuate fasciculus with SLF, corpus callosum (posterior parts–forceps major), cingulate, corticospinal tract and ATR. The severity of hallucinations correlated negatively with white matter integrity in tracts connecting the left frontal lobe with temporal regions (uncinate fasciculus, IFOF, cingulum, arcuate fasciculus anterior and long part and superior long fasciculus frontal part) and in interhemispheric connections (anterior corona radiata). These findings support the hypothesis that hallucinations in schizophrenia are accompanied by a complex pattern of white matter alterations that negatively affect the language, emotion and attention/perception networks.

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Abbreviations

ACC:

Anterior cingulate cortex

ACR:

Anterior corona radiata

AF:

Anterior fasciculus

ATR:

Anterior thalamic radiation

AVH:

Auditory verbal hallucinations

DTI:

Diffusion tensor imaging

IFG:

Inferior frontal gyrus

IFOF:

Inferior fronto-occipital fasciculus

ILF:

Inferior longitudinal fasciculus

FA:

Fractional anisotropy

ROI:

Region of interest

SLF:

Superior longitudinal fasciculus

TBSS:

Tract-based spatial statistics

TFCE:

Threshold-free cluster enhancement

UF:

Uncinate fasciculus

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Acknowledgments

The authors thank G.R. Blake for his comments on earlier versions of the manuscript. We thank psychiatrists Dr. R. Bruggeman and Dr. H. Knegtering for their help with patient inclusion. Our thanks are due especially to A. de Vos and J. van der Velde for help with data sorting and to S. Chalavi for discussions on analysis. L. Cerliani is supported by an NWO MaGW Open competition grant (grant number 400-08-089) and by an NIHC grant (grant number 056-13-017). This research was supported by a EURYI Award from the European Science Foundation (No. 044035001) awarded to A.A.

Conflict of interest

The authors declare that they have no competing financial interests in relation to the work described.

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Correspondence to Branislava Ćurčić-Blake.

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Ćurčić-Blake, B., Nanetti, L., van der Meer, L. et al. Not on speaking terms: hallucinations and structural network disconnectivity in schizophrenia. Brain Struct Funct 220, 407–418 (2015). https://doi.org/10.1007/s00429-013-0663-y

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