Electrocortical activity changes in response to unpredictable trip perturbations induced by a split-belt treadmill

Area of Science:

• Neuroscience
• Motor Control
• Human Movement Science

Background:

• Understanding neural mechanisms of gait stability is essential for preventing falls.
• Trip perturbations challenge balance and reveal sensorimotor control strategies.
• The primary sensorimotor cortex (SMC) and posterior parietal cortex (PPC) are implicated in motor control and spatial processing.

Purpose of the Study:

• To investigate the electrocortical activity in the SMC and PPC during recovery from unpredictable trip perturbations.
• To quantify changes in brain activity associated with gait stability and balance recovery.
• To explore the role of specific cortical regions in adapting to sudden walking disturbances.

Main Methods:

• Utilized a programmable split-belt treadmill to induce unpredictable trip perturbations during walking.
• Recorded 128-channel non-invasive electroencephalography (EEG) signals from participants.
• Performed power spectral analysis on EEG data to assess electrocortical activity in the SMC and PPC during quiet standing, steady-state walking, and recovery phases.

Main Results:

• Alpha (8-13 Hz) power in both the SMC and PPC was significantly suppressed during the recovery period following trip perturbations.
• This suppression was more pronounced during recovery compared to periods of quiet standing and steady-state walking.
• Electrocortical activity changes in these key cortical areas reflect dynamic adjustments for balance recovery.

Conclusions:

• The findings highlight the significant contribution of the SMC and PPC to rapid recovery responses after gait perturbations.
• Suppressed alpha power in these regions during recovery suggests increased neural processing for motor adaptation.
• This research can inform the development of gait rehabilitation strategies using perturbation-based training for improved balance and fall prevention.