How can neural engineering reroute signals around damaged areas of the brain or spinal cord?

Neural engineering leverages the brain's inherent neuroplasticity—the capacity of neural networks to reorganize in response to damage—to restore function after injury. By combining engineering technologies with neuroscience, researchers can bypass damaged areas of the brain or spinal cord using several methods:12

• Signal Rerouting: Electronic sensors can detect sensory signals from the skin or eyes and deliver them to the cerebral cortex as electrical stimulus trains, effectively bypassing damaged pathways.2
• Brain-Computer Interfaces (BCIs): These systems monitor neural activity and translate brain signals into commands for external devices, such as robotic arms or cursors. As users practice, the brain can incorporate these tools into its body image, demonstrating the brain's ability to adapt its motor cortex to new control parameters.23
• Electrical Stimulation: Implantable stimulators, such as neural cuffs, can be placed around nerves to detect phases of movement or activate muscles, helping to restore motor function or assist in recovery of walking after spinal cord injury.24

These technologies demonstrate that the nervous system can be "retrained" to process information through alternative routes, harnessing the brain's ability to adapt to new electrochemical inputs.3