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Biological Causes of Schizophrenia01:29

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Schizophrenia, a severe psychiatric disorder, arises from a complex interplay of biological factors, including genetic predisposition, structural brain abnormalities, neurotransmitter dysregulation, and developmental irregularities. These factors collectively contribute to the onset and progression of the disorder, which typically manifests in late adolescence or early adulthood.
Genetic Factors in Schizophrenia
The genetic basis of schizophrenia is strongly supported by family and twin studies.

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Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases
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Diffusion tensor anisotropy in the cingulate gyrus in schizophrenia.

Devorah Segal1, M Mehmet Haznedar, Erin A Hazlett

  • 1Department of Neuroscience, Mount Sinai School of Medicine, New York, NY 10029, USA.

Neuroimage
|January 5, 2010
PubMed
Summary

Schizophrenia is linked to brain connectivity changes, particularly in the cingulate cortex. This study found reduced gray matter volume and altered white matter anisotropy in individuals with schizophrenia.

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Area of Science:

  • Neuroscience
  • Psychiatry
  • Medical Imaging

Background:

  • Schizophrenia is hypothesized to involve disruptions in brain connectivity.
  • The anterior cingulate cortex (ACC) shows abnormalities in schizophrenia, including reduced volume and altered diffusion tensor imaging (DTI) metrics.
  • Previous research indicates structural and metabolic changes in the ACC in schizophrenia patients.

Purpose of the Study:

  • To investigate structural and microstructural differences in the anterior and posterior cingulate gyri in schizophrenia.
  • To compare gray matter volume and white matter anisotropy in patients with recent-onset and chronic schizophrenia versus healthy controls.

Main Methods:

  • Structural and diffusion tensor imaging (DTI) were acquired using a 3T Siemens scanner.
  • Manual tracing of anterior and posterior cingulate gyri was performed.
  • Volume and anisotropy were compared across groups (recent-onset schizophrenia, chronic schizophrenia, healthy controls), analyzing gray and white matter separately.

Main Results:

  • Individuals with schizophrenia exhibited decreased relative gray matter volume in the anterior cingulate gyrus compared to controls.
  • Anisotropy in both gray and white matter of the cingulate gyrus differed significantly across groups: highest in recent-onset schizophrenia, lowest in chronic schizophrenia, and intermediate in controls.

Conclusions:

  • The findings support the role of cingulate gyrus abnormalities, encompassing both gray and white matter, in schizophrenia.
  • Altered anisotropy may reflect distinct stages or processes within the disease progression.