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Brain Morphology of Cannabis Users With or Without Psychosis: A Pilot MRI Study
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Brain structural changes in schizophrenia patients with persistent hallucinations.

Owen G O'Daly1, Sophia Frangou, Xavier Chitnis

  • 1P.O. Box 63, Section of General Psychiatry, Institute of Psychiatry, London, UK. O.O'Daly@iokcl.ac.uk

Psychiatry Research
|August 28, 2007
PubMed
Summary

Structural brain changes in schizophrenia are linked to auditory hallucinations. Grey matter deficits in specific brain regions correlate with hallucination severity, impacting self-monitoring.

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Radiology

Background:

  • Schizophrenia presents diverse symptoms, with unclear brain structural links for specific manifestations like auditory hallucinations.
  • While ventricular enlargement and grey matter deficits are recognized, precise correlates for symptoms remain elusive.

Purpose of the Study:

  • To investigate the brain structural correlates of auditory hallucinations in patients with schizophrenia.
  • To identify specific grey matter (GM) and white matter (WM) differences associated with hallucination severity.

Main Methods:

  • Utilized automated voxel-wise analysis of dual-echo spin-echo MRI data.
  • Compared 28 patients with schizophrenia experiencing persistent hallucinations against 32 healthy controls.

Main Results:

  • Patients showed GM volume decrements in the insula, right superior temporal and fusiform gyri, and left inferior temporal gyrus.
  • GM losses (excluding insula) correlated with auditory hallucination severity.
  • Observed GM excesses in the right caudate nucleus and middle temporal gyrus, and WM deficits in specific brain areas.

Conclusions:

  • Structural changes in neural circuits processing affect-laden information are implicated in schizophrenia with auditory hallucinations.
  • These deficits may impair recognition of internal speech, contributing to self-monitoring failures.