Mental practice modulates functional connectivity between the cerebellum and the primary motor cortex.

Area of Science:

• Neuroscience
• Motor Control
• Cognitive Science

Background:

• The brain's ability to refine motor skills via mental practice is well-documented.
• This capacity is theoretically linked to internal forward models, which are neural networks within the cerebellum responsible for predicting sensory outcomes of motor commands.

Purpose of the Study:

• To investigate the neurophysiological underpinnings of motor skill enhancement through mental practice.
• To examine changes in corticospinal excitability and cerebellar-brain inhibition following mental practice.

Main Methods:

• Utilized single and dual-coil transcranial magnetic stimulation (TMS) to assess neural activity.
• Measured motor skill performance (accuracy and speed) using a sequential finger tapping task.
• Compared outcomes after a mental practice session versus a control session.

Main Results:

• Mental practice significantly improved both the speed and accuracy of motor skills.
• Observed a decrease in cerebellar-brain inhibition, indicating altered functional connectivity between the cerebellum and the primary motor cortex.
• Neuroplastic changes within the cerebellum were evident post-mental practice.

Conclusions:

• Mental practice induces measurable neuroplastic changes in the cerebellum.
• These changes support the involvement of internal forward models in motor skill acquisition and refinement.
• The findings provide insights into the neural mechanisms underlying motor learning through imagination.