David Savage probably never expected to look down and see someone else’s hand attached to his right arm. Neither did he anticipate using the strange appendage to illuminate how the brain works. But ...

A woman loses her hand, yet her brain doesn’t seem to notice. Months later, when she tries to “move” her phantom fingers, the same pattern of brain activity lights up as it did before surgery. A study ...

Scientists have long known that humans have unique neural “hand maps,” or regions of the brain tasked with processing sensations experienced by each of the five fingers. These patterns vary depending ...