Abnormal Cortico-Cerebellar Functional Connectivity in Autism Spectrum Disorder

Area of Science:

• Neuroscience
• Developmental Neuroscience
• Brain Imaging

Background:

• Autism spectrum disorder (ASD) is a neurodevelopmental condition characterized by social communication deficits and restricted, repetitive behaviors.
• Previous research indicates widespread brain abnormalities in ASD, but cortico-cerebellar connectivity remains underexplored.
• The cerebral cortex and cerebellum, though spatially distinct, are interconnected by complex neural circuits crucial for various cognitive functions.

Purpose of the Study:

• To investigate differences in intrinsic cortico-cerebellar functional connectivity between individuals with typical development (TD) and those with ASD.
• To identify specific cortical regions showing altered connectivity with the cerebellum in ASD.

Main Methods:

• Utilized functional magnetic resonance imaging (fMRI) data from resting-state protocols.
• Analyzed data from a large cohort of 708 subjects from the Autism Brain Imaging Data Exchange (ABIDE) I Consortium.
• Validated findings in an independent cohort of 585 subjects from the ABIDE II Consortium.

Main Results:

• Individuals with ASD exhibited diminished functional connectivity between the cerebellum and several cortical regions, including the right fusiform gyrus, right postcentral gyrus, right superior temporal gyrus, right middle temporal gyrus, and left middle temporal gyrus.
• The identified regions are implicated in cognitive functions frequently affected in ASD.
• Key findings for the right fusiform gyrus, right superior temporal gyrus, and left middle temporal gyrus were replicated in the ABIDE II cohort.

Conclusions:

• The study reveals consistent atypical cortico-cerebellar functional connectivity in individuals with ASD.
• These findings highlight the cerebellum's role in ASD pathophysiology and suggest potential targets for future interventions.
• Altered connectivity patterns underscore the complex neural network disruptions present in autism spectrum disorder.