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About H.M., who lost the ability to form new (conscious) memories in his 20s ... though his ability to learn things in "unconsciously" remained.

 H. M., an Unforgettable Amnesiac, Dies at 82

"Every time H. M. performed the task, it struck him as an entirely new experience. He had no memory of doing it before. Yet with practice he became proficient. 'At one point he said to me, after many of these trials, ‘Huh, this was easier than I thought it would be,’ ' Dr. Milner said."

Here is someone who lived almost an entire lifetime without the ability to form any sort of coherent narrative ...