Large-scale functional network dynamics in human callosal agenesis: Increased subcortical involvement and preserved...

Area of Science:

• Neuroscience
• Developmental Neuroscience
• Cognitive Neuroscience

Background:

• The corpus callosum is crucial for interhemispheric communication in the human brain.
• Agenesis of the corpus callosum (AgCC) is a condition where the corpus callosum fails to develop.
• Despite AgCC, functional brain connectivity, including interhemispheric pathways, is often preserved.

Purpose of the Study:

• To investigate the role of subcortical structures in maintaining functional connectivity in individuals with AgCC.
• To explore alternative neural pathways that may compensate for the absence of the corpus callosum.
• To analyze temporal characteristics of whole-brain functional networks in children with and without AgCC.

Main Methods:

• Functional Magnetic Resonance Imaging (fMRI) was employed to record brain activity.
• A time-resolved approach was utilized to analyze the temporal dynamics of functional networks.
• Participants included children with AgCC and typically developing children.

Main Results:

• Children with AgCC demonstrated increased engagement of cerebellum and amygdala/hippocampus networks.
• No significant differences were observed in the laterality of activation networks between groups.
• Findings suggest subcortical structures contribute to functional brain reorganization in AgCC.

Conclusions:

• Subcortical structures play a vital role in compensating for the absence of the corpus callosum.
• The brain exhibits remarkable plasticity in reconfiguring functional networks.
• These findings support the hypothesis of alternative pathways facilitating interhemispheric communication in AgCC.