The story of Henry Molaison is a sad one. Known as Patient H.M. to the medical community, he lost the ability to create memories after he underwent a lobotomy to treat his seizures.
He did earn a place in history, though. His case taught scientists a lot about how the brain creates and stores memories.
"A lot of what we know about how memory work came from more than a half-century of experimentation that was conducted on Patient H.M.," says Luke Dittrich, author of the book Patient H.M. : A Story of Memory, Madness and Family Secrets.