TED-Ed: What happens when you remove the hippocampus? - Sam Kean

In 1953, Dr. William Scoville performed a lobotomy on Henry Molaison (H.M.) to treat his seizures, removing his hippocampus. While the surgery reduced seizures, it severely impaired H.M.'s memory, preventing him from forming new long-term memories. Brenda Milner's research on H.M. revealed distinctions between short-term and long-term memory, and between declarative and procedural memory. These findings revolutionized our understanding of memory processes. H.M.'s case became a cornerstone in neuroscience, with his brain extensively studied after his death, contributing significantly to memory research.

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