The cerebellum monitors errors and entrains executive networks

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Motor Control

Background:

• Frontal midline theta (Fmθ) activity, originating in medial prefrontal cortices (mPFC), is associated with conflicts between expected and actual outcomes.
• Cerebellar forward models are hypothesized to play a role in detecting and signaling these outcome mismatches to the mPFC.

Purpose of the Study:

• To investigate the role of the cerebellum in informing the mPFC about outcome conflicts during a visuomotor tracking task.
• To determine if cerebellar function is necessary for the generation of Fmθ activity in response to performance errors.

Main Methods:

• Correlated mPFC activation (measured via Fmθ) with performance accuracy during a visuomotor (VM) tracking task in healthy controls and cerebellum-lesioned participants.
• Participants also performed purely visual (V), motor (M), and combined visual-motor (V+M) tasks.
• Independent Component Analysis (ICA) was used to isolate Fmθ activity, with dipole localization in the dorsal anterior cingulate cortex.

Main Results:

• In controls, Fmθ power increased during VM tasks when error levels exceeded a threshold, scaling with tracking error, but not in V, M, or V+M tasks.
• This Fmθ increase was absent in cerebellum-lesioned participants, even at high error levels during the VM task.
• Fmθ activity was linked to continuous monitoring and online error detection, suggesting a switch to executive control when automatic processes falter.

Conclusions:

• The cerebellum is essential for providing the mPFC with prediction error information, particularly when automatic visuomotor control fails.
• This cerebellar contribution appears necessary for triggering the deliberate error correction mechanisms reflected by mPFC activation (Fmθ).
• Further research is needed to explore this cerebellar alerting function in other cognitive and non-cognitive domains.