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World J Biol Psychiatry. 2015 Jan;16(1):31-44. doi: 10.3109/15622975.2014.948063. Epub 2014 Sep 16.

Auditory verbal hallucinations and the interhemispheric auditory pathway in chronic schizophrenia.

Author information

1
Department of Psychiatry, Psychiatry Neuroimaging Laboratory, Brigham and Women's Hospital, Harvard Medical School , Boston, MA , USA.

Abstract

OBJECTIVES:

The interhemispheric auditory pathway has been shown to play a crucial role in the processing of acoustic stimuli, and alterations of structural and functional connectivity between bilateral auditory areas are likely relevant to the pathogenesis of auditory verbal hallucinations (AVHs). The aim of this study was to examine this pathway in patients with chronic schizophrenia regarding their lifetime history of AVHs.

METHODS:

DTI scans were acquired from 33 healthy controls (HC), 24 schizophrenia patients with a history of AVHs (LT-AVH) and nine schizophrenia patients without any lifetime hallucinations (N-LT-AVH). The interhemispheric auditory fibre bundles were extracted using streamline tractography. Subsequently, diffusivity indices, namely Fractional Anisotropy (FA), Trace, Mode, Axial and Radial diffusivity, were calculated.

RESULTS:

FA was decreased over the entire pathway in LT-AVH compared with N-LT-AVH. Moreover, LT-AVH displayed decreased FA and Mode as well as increased radial diffusivity in the midsagittal section of the fibre tract.

CONCLUSIONS:

These findings indicate complex microstructural changes in the interhemispheric auditory pathway of schizophrenia patients with a history of AVHs. Alterations appear to be absent in patients who have never hallucinated.

KEYWORDS:

MRI; auditory verbal hallucinations; brain imaging; diffusion tensor imaging; schizophrenia

PMID:
25224883
PMCID:
PMC4698973
DOI:
10.3109/15622975.2014.948063
[Indexed for MEDLINE]
Free PMC Article

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