The case of h. m. shows that the is integral in the formation of new long-term declarative memories.

H.M. stands for Henry Molaison. And the case of H.M is the event when Henry lost his memory on an operating table in a hospital in Hartford, in August 1953 (age 27).
The case of H. M. shows that the hippocampus is integral in the formation of new long-term declarative memories.

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