Exploratory factor analysis of MRI brain structure measures in schizophrenia

Area of Science:

• Neuroimaging and Psychiatry
• Statistical Analysis in Neuroscience

Background:

• Schizophrenia is associated with regional brain abnormalities.
• The complex interrelationships between affected brain regions remain unclear.
• Statistical methods like factor analysis are underutilized for analyzing complex neuroimaging data.

Purpose of the Study:

• To investigate structural relationships between cortical and subcortical brain regions in schizophrenia using factor analysis.
• To compare the brain's latent structural factors between healthy controls and individuals with schizophrenia.

Main Methods:

• Exploratory and confirmatory factor analysis applied to regional brain volumes from MRI scans.
• Data from 60 healthy subjects and 44 individuals with schizophrenia.
• Analysis of both bilateral and unilateral brain structures.

Main Results:

• Identified common factors (basal ganglia, heteromodal cortical gray, medial temporal lobe) in both groups.
• Observed disrupted bilateral symmetry in schizophrenia, most affecting temporal lobe structures.
• Found a significant correlation between basal ganglia and heteromodal cortical gray factors in controls, absent in schizophrenia.
• Left posterior superior temporal gyrus showed no factor loading in schizophrenia patients.

Conclusions:

• Schizophrenia involves abnormal structural relationships between brain regions.
• Heteromodal dorsolateral prefrontal and superior temporal cortical gray regions appear structurally related.
• Factor analysis shows promise for studying complex neuropsychiatric relationships, though further replication is needed.