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Cerebellar Structure and Cognitive Ability in Psychosis
Alexandra B Moussa-Tooks1, Baxter P Rogers2, Anna S Huang1
1Department of Psychiatry and Behavioral Sciences, Vanderbilt University School of Medicine, Nashville, Tennessee.
Biological Psychiatry
|June 9, 2022
Summary
Cerebellar structure in psychosis is not directly linked to diagnosis or illness stage. Instead, lower premorbid cognitive functioning is associated with smaller cerebellum volumes in individuals with psychosis.
Area of Science:
- Neuroscience
- Psychiatry
- Neuroimaging
Background:
- Dysconnectivity theories highlight cerebellar abnormalities in psychosis.
- Previous studies noted smaller cerebellar gray matter in schizophrenia spectrum disorders.
- The impact of illness stage, diagnostic specificity, and cognitive function on cerebellar deficits remains unclear.
Purpose of the Study:
- To investigate cerebellar structural differences in psychosis.
- To examine the influence of diagnosis (schizophrenia spectrum vs. bipolar disorder) and illness stage (early vs. chronic) on cerebellar volume.
- To determine the relationship between premorbid cognitive functioning and cerebellar structure in psychosis.
Main Methods:
- Utilized the Spatially Unbiased Infratentorial toolbox for cerebellar analysis.
- Analyzed structural magnetic resonance images from 574 participants (schizophrenia spectrum, bipolar disorder with psychotic features, nonpsychiatric controls).
- Performed voxel-based morphometry to quantify cerebellar volumes and assess group differences.
Main Results:
- No significant differences in cerebellar structure were found between individuals with psychosis and healthy controls, irrespective of diagnosis or illness stage.
- Lower premorbid cognitive functioning was significantly associated with smaller whole and regional cerebellar volumes in psychosis.
- These cognitive-related cerebellar volume reductions were observed in both cognitive and motor regions and were absent in psychosis cohorts with average premorbid cognition.
Conclusions:
- Cerebellar structural abnormalities in psychosis are linked to impaired premorbid cognitive functioning.
- This association suggests potential early neurodevelopmental factors contributing to cerebellar dysfunction in psychosis.
- Further research is needed to explore the impact of early-life risk factors on cerebellar development and cognition in psychosis.
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