Task-Dependent Neural Activity in the Posterior Parietal Cortex Is Associated with Better Balance in Adults with...

Area of Science:

• Neuroscience
• Rehabilitation Medicine
• Biomechanics

Background:

• Limited evidence exists on the neural basis of balance in individuals with chronic acquired brain injury (ABI).
• Understanding these neural mechanisms is crucial for developing targeted rehabilitation strategies.
• Balance deficits are common after ABI and significantly impact functional independence.

Purpose of the Study:

• To measure neural activity during balance tasks in adults with chronic ABI.
• To explore the relationship between brain activity and balance performance.
• To identify specific brain regions involved in maintaining balance post-ABI.

Main Methods:

• Functional near-infrared spectroscopy (fNIRS) was employed to assess task-dependent neural activity (hemoglobin oxygenation).
• Balance performance was quantified using sway measurements from a force plate.
• Statistical analyses included t-tests for neural activity and Pearson correlations for brain-behavior relationships.

Main Results:

• Significant task-dependent neural activity was detected in the superior and inferior parietal lobes (IPL).
• Moderate negative correlations were found between IPL neural activity and postural sway (balance performance).
• Increased recruitment in the inferior parietal lobes was associated with reduced sway during balance tasks.

Conclusions:

• The study identified significant task-dependent neural activity in the superior and inferior parietal lobes during balance tasks in individuals with ABI.
• Greater neural engagement in the inferior parietal lobes is linked to improved balance control.
• These findings provide novel insights into the neural underpinnings of balance in ABI populations.