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Alterations in prefrontal connectivity in schizophrenia assessed using diffusion magnetic resonance imaging
Vicente Molina1, Alba Lubeiro2, Oscar Soto2
1Psychiatry Department, School of Medicine, University of Valladolid, Av. Ramón y Cajal, 7, 47005 Valladolid, Spain; Psychiatry Service, Clinical Hospital of Valladolid, Ramón y Cajal, 3, 47003 Valladolid, Spain; Neurosciences Institute of Castilla y León (INCYL), Pintor Fernando Gallego, 1, 37007, University of Salamanca, Spain; CIBERSAM (Biomedical Research Network in Mental Health), Instituto de Salud Carlos III, Spain.
Schizophrenia patients exhibit altered frontal lobe structural connectivity, impacting cognition and symptoms. These brain changes correlate with illness duration but not treatment dosage, highlighting key areas for future research.
Area of Science:
- Neuroimaging
- Neuroscience
- Psychiatry
Background:
- Structural frontal disconnectivity in schizophrenia is not fully understood.
- Streamline count (SC) and fractional anisotropy (FA) offer complementary insights into white matter integrity.
Purpose of the Study:
- To investigate spatial and biological characteristics of frontal structural connectivity in schizophrenia.
- To correlate these connectivity measures with cognitive function, symptoms, and illness duration.
Main Methods:
- 3T diffusion magnetic resonance imaging was used to calculate SC and FA in tracts connecting prefrontal cortex (PFC) subregions to subcortical areas.
- 27 schizophrenia patients and 27 controls were analyzed, with relationships to clinical variables assessed.
Main Results:
- Schizophrenia patients showed reduced SC and FA in PFC-thalamus and PFC-caudate tracts, and altered SC in PFC-cingulate tracts.
- Connectivity measures correlated with cognitive functions (e.g., executive function) and symptom severity (positive and negative symptoms).
- Illness duration was negatively associated with SC and FA, while treatment dose showed no association.
Conclusions:
- Schizophrenia involves widespread alterations in frontal structural connectivity of the PFC.
- These alterations are linked to cognitive deficits, clinical symptoms, and the progression of the illness.
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