Post-Movement Beta Activity in Sensorimotor Cortex Indexes Confidence in the Estimations from Internal Models

Area of Science:

• Neuroscience
• Motor Control
• Computational Neuroscience

Background:

• Beta oscillations are prominent in the sensorimotor system.
• Post-movement beta synchronization (PMBS) increases after voluntary movement cessation.
• Existing theories focus on PMBS's role in motor closure or sensory processing.

Purpose of the Study:

• To investigate the function of PMBS in sensorimotor control.
• To reconcile motor and sensory theories of PMBS.
• To propose a unifying theory for PMBS function.

Main Methods:

• Examined PMBS amplitude in young healthy subjects during a sensorimotor adaptation task.
• Assessed modulation by visual feedback of errors and exploratory adjustments.
• Utilized a Bayesian learning model to estimate feedforward estimation uncertainty.

Main Results:

• PMBS amplitude correlated negatively with trial-to-trial exploratory adjustments.
• PMBS amplitude was modulated by visual feedback of errors.
• PMBS amplitude negatively correlated with feedforward estimation uncertainty.

Conclusions:

• PMBS indexes confidence in internal feedforward estimation within Bayesian sensorimotor integration.
• PMBS amplitude reflects sensory processing and signals motor output needs (maintenance, adaptation, or exploration).
• This research offers insights into movement disorders linked to aberrant beta activity.