Abnormal Brain Connectivity in First-Episode Psychosis
Author Information
Author(s): Gary Price, Mara Cercignani, Geoffrey J.M. Parker, Daniel R. Altmann, Thomas R.E. Barnes, Gareth J. Barker, Eileen M. Joyce, Maria A. Ron
Primary Institution: University College London
Hypothesis
Measures of tract coherence (FA) in white matter traversing the genu and splenium of the corpus callosum would be significantly reduced in the patient group compared to controls.
Conclusion
The study found altered interhemispheric connectivity in patients with first-episode schizophrenia spectrum disorders, indicated by reduced tract coherence in the corpus callosum.
Supporting Evidence
- Reduced FA was observed in tracts crossing the genu of the corpus callosum in patients compared to controls.
- FA was also lower in females across both groups, indicating a potential gender effect.
- The study utilized a probabilistic tractography algorithm to assess white matter integrity.
Takeaway
The study looked at the brains of people with early signs of schizophrenia and found that the connections between the two halves of their brains were not working as well as in healthy people.
Methodology
Diffusion MRI tractography was used to study the corpus callosum in 18 patients with first-episode psychosis and 21 healthy controls, measuring fractional anisotropy (FA) to assess tract coherence.
Potential Biases
Potential bias due to the small sample size and the reliance on self-reported data for substance use.
Limitations
The study's findings may be influenced by the age difference between patients and controls, and the diagnostic heterogeneity of the patient group.
Participant Demographics
The patient group had a mean age of 23.6 years, with 8 males and 10 females; the control group had a mean age of 29.4 years, with 6 males and 15 females.
Statistical Information
P-Value
0.011
Confidence Interval
[-41.7, 17.2]
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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