When H.M. (Henry Molaison) had his hippocampus removed, he was 27 years old. This surgery, performed in 1953 to treat his severe epilepsy, led to significant changes in his memory. While it did alleviate his seizures, it also resulted in profound anterograde amnesia, meaning he was unable to form new long-term memories following the operation. He became a pivotal case study in neuroscience, helping researchers understand the role of the hippocampus in memory formation.
when h.m. had his hippocampus remover he was ___
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