What kind of amnesia did HM (Henry Molasion) have?
Anterograde
HM, also known as Henry Molaison, had anterograde amnesia. This is a type of amnesia that affects a person’s ability to form new memories after the onset of amnesia. While HM could recall memories from his past up until his surgery, he was unable to create new memories, including those related to his daily experiences, events, and people he met after the surgery. This made it difficult for him to retain new information, cope with new situations, and carry out his daily activities normally, requiring him to rely on external aids to function. Despite his anterograde amnesia, researchers were able to study HM’s short-term memory by using specific experimental tests and stimuli, which contributed greatly to our understanding of brain function and memory formation.
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