Henry Molaison: How Patient HM Changed What We Know About Memory

In 1953, Henry Molaison (known in the academic literature simply as "Patient HM") agreed to undergo an experimental procedure where a part of his brain located in the medial temporal lobe was removed.

He woke up from the lobotomy unable to form any new memories. Scientists were puzzled as they realised that any new memories Molaison had acquired before the surgery remained largely intact.

Eventually, Henry Molaison became the most studied patient in the history of psychology, becoming the subject of endless research papers and books.

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