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A Prospective Evaluation of Infant Cerebellar-Cerebral Functional Connectivity in Relation to Behavioral Development
Zoë W Hawks1, Alexandre Todorov2, Natasha Marrus2
1Department of Psychological and Brain Sciences, Washington University in St. Louis, St. Louis, Missouri.
Insights
This study found no direct link between infant cerebellar connectivity and autism spectrum disorder (ASD). However, other brain networks showed early signs related to ASD behaviors, suggesting alternative pathways for future research.
Area of Science:
- Neuroscience
- Developmental Psychology
- Pediatric Neurology
Background:
- Autism spectrum disorder (ASD) is a neurodevelopmental disorder characterized by social and behavioral differences.
- Current theories suggest that early cerebellar problems may impact error-based learning (EBL), potentially contributing to ASD.
- This research is the first to prospectively investigate this cerebellar pathology theory in infants.
Purpose of the Study:
- To test the hypothesis that cerebellar pathology in infancy causally contributes to ASD via disrupted EBL.
- To examine the relationship between 6-month cerebellar functional connectivity and later ASD-associated behaviors.
- To explore potential early detection markers for ASD.
Main Methods:
- Used functional connectivity magnetic resonance imaging (fcMRI) on 94 infants (68 male) at 6 months of age.
- Analyzed cerebellar connections with the frontoparietal network (FPN; related to EBL) and default mode network (DMN; implicated in ASD).
- Employed univariate analyses and machine learning for predictive testing; data-driven enrichment identified brain-wide associations.
Main Results:
- No significant association was found between cerebellar-FPN or cerebellar-DMN functional connectivity and ASD outcomes.
- fcMRI enrichment revealed early (6-month) correlates of later ASD-associated behaviors in the FPN, DMN, cingulo-opercular, and medial visual networks.
- Post hoc analyses did not support a role for cerebellar connections in these associations.
Conclusions:
- The study did not find evidence for cerebellar functional connectivity directly contributing to ASD in infancy.
- Prospective correlates of ASD-associated behaviors were identified in other brain networks crucial for EBL.
- Future research should explore network-level findings and investigate cerebellar roles across different developmental stages or using varied neuroimaging techniques.
Background:
Autism spectrum disorder (ASD) is a neurodevelopmental disorder diagnosed based on social impairment, restricted interests, and repetitive behaviors. Contemporary theories posit that cerebellar pathology contributes causally to ASD by disrupting error-based learning (EBL) during infancy. The present study represents the first test of this theory in a prospective infant sample, with potential implications for ASD detection.
Methods:
Data from the Infant Brain Imaging Study (n = 94, 68 male) were used to examine 6-month cerebellar functional connectivity magnetic resonance imaging in relation to later (12/24-month) ASD-associated behaviors and outcomes. Hypothesis-driven univariate analyses and machine learning-based predictive tests examined cerebellar-frontoparietal network (FPN; subserves error signaling in support of EBL) and cerebellar-default mode network (DMN; broadly implicated in ASD) connections. Cerebellar-FPN functional connectivity was used as a proxy for EBL, and cerebellar-DMN functional connectivity provided a comparative foil. Data-driven functional connectivity magnetic resonance imaging enrichment examined brain-wide behavioral associations, with post hoc tests of cerebellar connections.
Results:
Cerebellar-FPN and cerebellar-DMN connections did not demonstrate associations with ASD. Functional connectivity magnetic resonance imaging enrichment identified 6-month correlates of later ASD-associated behaviors in networks of a priori interest (FPN, DMN), as well as in cingulo-opercular (also implicated in error signaling) and medial visual networks. Post hoc tests did not suggest a role for cerebellar connections.
Conclusions:
We failed to identify cerebellar functional connectivity-based contributions to ASD. However, we observed prospective correlates of ASD-associated behaviors in networks that support EBL. Future studies may replicate and extend network-level positive results, and tests of the cerebellum may investigate brain-behavior associations at different developmental stages and/or using different neuroimaging modalities.
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