The Sense: The brain integrates senses like touch, vision, and proprioception to create a feeling of ownership of our body parts.

The Fix: Reroute severed arm nerves to another location on an amputee’s body, like the chest.

“I was in the shower, and hot water was hitting my chest. And suddenly, I felt my hand. My nonexistent hand. It was as if I had both hands in front of me and the water was running down both my hands instead of actually hitting my chest.” —CLAUDIA MITCHELL