Two Patients Mysteriously Switch from Right- to Left-Handed After Double Hand Transplants

The flexible, adaptable human brain rewires itself to accommodate a double hand transplant, even in patients who waited years for their new hands, according to a new study. But in a perplexing result, researchers found that the two right-handed patients that they studied both formed quicker connections between their brains and their new left hands. The researchers studied the motor cortex, which devotes different areas to different body parts.