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A new study challenges what we know about how amputation alters the human brain

By Jon Hamilton

Published August 21, 2025 at 4:20 PM EDT

Even years after a person has lost an arm, the brain faithfully maintains the circuits that once controlled the missing limb.

Jon Hamilton

Jon Hamilton is a correspondent for NPR's Science Desk. Currently he focuses on neuroscience and health risks.

Stories From This Author

These brain implants speak your mind — even when you don't want to

Jon Hamilton

Brain-implanted devices that allow paralyzed people to speak can also decode words they imagine, but don't intend to share.
Brain implants that decode a person's inner voice may threaten privacy

Jon Hamilton

A new brain-computer interface can decode a person's inner monologue. That could help paralyzed people communicate, but also suggests scientists are one step closer to reading a person's thoughts.
Trying to keep your brain young? A big new study finds these lifestyle changes help

Jon Hamilton

A study of more than 2,100 people ages 60 to 79 found that an intensive two-year program of mental and physical activities, along with a heart-healthy diet, improved memory and thinking.