Brain Connectivity Changes During Bimanual and Rotated Motor Imagery

Area of Science:

• Neuroscience
• Rehabilitation Engineering
• Brain-Computer Interfaces

Background:

• Motor imagery-based brain-computer interface (MI-BCI) is a promising rehabilitation trend.
• Limitations include individual differences in responsive frequency bands and poor understanding of brain region communication.
• Bimanual training shows superior outcomes compared to one-handed training.

Purpose of the Study:

• To compare the effects of three MI tasks with different visual feedback.
• To investigate brain functional connectivity during different MI tasks.
• To evaluate the potential of bimanual coordination MI-BCI (bcMI-BCI) for rehabilitation.

Main Methods:

• Fourteen healthy subjects performed single-hand MI, single-hand with rotation MI (rmMI), and bimanual coordination MI (bcMI) tasks.
• Visual feedback varied across tasks (static hand, rotating hand, hand pedal exerciser).
• Functional connectivity was analyzed using Transfer Entropy (TE) to assess brain information flow.

Main Results:

• Bimanual coordination MI (bcMI) tasks increased communication from parietal to bilateral prefrontal areas.
• bcMI tasks showed increased contralateral connections between motor-related zones and spatial processing regions.
• Results indicate enhanced spatial information and motor planning during bcMI tasks.

Conclusions:

• Bimanual coordination MI tasks improve spatial information processing and motor planning.
• The proposed bcMI-BCI is effective and promotes better integration of motor-cortex functions.
• bcMI-BCI offers a more effective approach for MI-BCI therapy and rehabilitation of impaired motor functions.