H.M. has been unable to store new information in long-term memory since his surgery in 1953. H.M. has a profound case of

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H.M.'s inability to store new information in long-term memory since his surgery in 1953 suggests he suffers from anterograde amnesia, which is the inability to form new memories after an event, injury, or experience. Repression is the process of blocking memories, while retrograde amnesia is the inability to retrieve memories before an event. Korsakoff's syndrome is a brain disorder that causes memory loss, along with other symptoms like confusion and vision changes but is typically caused by long-term alcohol abuse.

HM Has Been Unable to Store New Information in Long-Term