Greater functional activation during galvanic vestibular stimulation is associated with improved postural stability:...

Area of Science:

• Neuroscience
• Human Physiology
• Sensory Systems

Background:

• Standing stability is crucial for daily activities.
• The vestibular system is known to influence balance.
• Neural mechanisms underlying standing stability are not fully understood.

Purpose of the Study:

• To investigate the neural correlates of standing stability.
• To use functional magnetic resonance imaging (fMRI) to observe brain activity during galvanic vestibular stimulation (GVS).
• To associate brain activity patterns with measures of postural stability.

Main Methods:

• Forty-five healthy volunteers participated.
• Postural stability was assessed using the modified Clinical Test of Sensory Interaction and Balance (mCTSIB).
• fMRI was employed to measure blood oxygenation level-dependent (BOLD) responses during GVS.

Main Results:

• GVS led to increased BOLD signals in the parietal operculum, central operculum, and inferior frontal gyrus.
• Higher functional activation in the central operculum correlated with reduced standing stability.
• This correlation was particularly evident on foam surfaces with eyes closed.

Conclusions:

• The central operculum plays a significant role in maintaining standing stability.
• Greater activation in this area may indicate compensatory mechanisms for balance challenges.
• These findings provide insights into the neural basis of postural control.