Cortical Correlates of Human Balance Control

Area of Science:

• Neuroscience
• Motor Control
• Systems Neuroscience

Background:

• Balance control is vital for daily activities like walking.
• Impaired balance increases fall risk, but underlying neural mechanisms are unclear.
• Previous research identified activated cortical regions during balancing, but network interactions remain understudied.

Purpose of the Study:

• To investigate the neurobiological mechanisms of human balance control.
• To explore cortical network interactions during single-leg balancing.
• To test the hypothesis that cortical networks optimize balance control.

Main Methods:

• Electroencephalography (EEG) recorded from 37 subjects during single-leg balancing.
• Analysis of functional connectivity using partial directed coherence (PDC).
• Comparison of brain activity on stable versus unstable surfaces.

Main Results:

• Two distinct functional cortical networks emerged during the transition from stable to unstable surface balancing.
• A theta frequency band network involved frontal, central, and parietal cortex modules.
• An alpha frequency band network showed occipital (O1, O2) as a source, projecting to parietal and centro-parietal areas.

Conclusions:

• Balance control is supported by at least two distinct functional cortical networks.
• Theta and alpha frequency band networks play specific roles in balance.
• These findings advance our understanding of the neurobiological basis of balance control.