His amnesia did not damage his intellect or radically change his personality. But he could not hold a job and lived, more so than any mystic, in the moment....He became an extremely useful subject for experiments relating to memory. Through him, scientists discovered the difference between "declarative memory" and "motor learning."
[Molaison] sensed from all the scientists, students and researchers parading through his life that he was contributing to a larger endeavor, though he was uncertain about the details...
He was ... a self-conscious presence, as open to a good joke and as sensitive as anyone in the room. Once, a researcher visiting with Dr. Milner and H. M. turned to her and remarked how interesting a case this patient was.
“H. M. was standing right there,” Dr. Milner said, “and he kind of colored — blushed, you know — and mumbled how he didn’t think he was that interesting, and moved away.”