What have psychologists learned about memory from their studies of the patient H.M.?

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The case of H.M. (Henry Molaison) taught psychologists that even with significant impairments in declarative memory (the ability to recall facts and events), a person can still form procedural memories (how to do things, like riding a bike or playing an instrument). H.M. had his hippocampus removed to treat severe epilepsy, which resulted in his inability to form new long-term declarative memories, yet he could learn new skills, demonstrating the distinction between declarative and procedural memory systems.

What Have Psychologists Learned About Memory from Their Studies of the Patient