Prefrontal cortex as a compensatory network in ataxic gait: a correlation study between cortical activity and gait...

Area of Science:

• Neuroscience
• Biomedical Engineering
• Clinical Neurology

Background:

• Ataxic gait, characterized by uncoordinated movements, often results from cerebellar dysfunction.
• Understanding the neural mechanisms, particularly prefrontal cortex (PFC) involvement, is crucial for developing effective interventions.
• The role of PFC functioning in gait variability versus compensatory mechanisms in ataxia remains unclear.

Purpose of the Study:

• To determine if prefrontal cortex (PFC) functioning during ataxic gait correlates with compensatory mechanisms or typical intra-subject gait variability.
• To elucidate the neural underpinnings of gait control in individuals with ataxia.

Main Methods:

• Nineteen patients with chronic ataxia and fifteen healthy controls underwent gait analysis (SMART-D500) and PFC oxygenation assessment (NIRO-200) during walking.
• Intra-subject gait variability was quantified using the coefficient of multiple correlation (CMC) for kinematic waveforms and by measuring step width.

Main Results:

• A significant positive correlation was found between bilateral PFC oxygenation changes and step width in ataxic patients (r = 0.54, p = 0.02 right; r = 0.50, p = 0.03 left).
• No significant correlation was observed between PFC activity and the CMC of hip, knee, or ankle kinematic waveforms.

Conclusions:

• Prefrontal cortex (PFC) activity during ataxic gait is more closely linked to gait compensatory mechanisms than to the inherent variability of joint kinematics.
• These findings suggest the PFC plays a key role in adapting gait in response to cerebellar dysfunction.