Corticocerebellar Effective Connectivity During Adapting to vs. Ignoring Delayed Visual Movement Feedback.

Area of Science:

• Neuroscience
• Cognitive Science
• Motor Control

Background:

• Internal brain models are essential for flexible action control.
• These models involve predictions of body state and sensory consequences of actions.
• The cerebellum plays a key role in these predictive processes.

Purpose of the Study:

• To investigate the neural mechanisms underlying visuomotor adaptation.
• To determine if task-dependent connectivity changes explain observed hemodynamic responses.
• To test the hypothesis that cerebellar predictions are communicated to the cortical visuomotor network.

Main Methods:

• A virtual reality hand-target matching task with delayed visual feedback.
• Functional magnetic resonance imaging (fMRI) to measure hemodynamic responses.
• Dynamic Causal Modeling (DCM) to analyze effective connectivity between brain regions.

Main Results:

• Increased hemodynamic responses were observed in the cerebellum, V5, and intraparietal sulcus during adaptation.
• Dynamic Causal Modeling revealed increased excitatory influence from the right cerebellum (Lobule VI) to bilateral V5 and the IPS.
• Increased mutual excitation was found between the right cerebellum and the left IPS during adaptation.

Conclusions:

• Cerebellar predictions are communicated to the cortical visuomotor network, underpinning visuomotor adaptation.
• Connectivity changes, particularly involving the cerebellum, are critical for adapting to delayed sensory feedback.
• This study elucidates the neural basis of flexible motor control and learning.