the way i understand it, memories are build up in layers, in the same way you'd build a building, lay down a foundation, then start building up, one layer of bricks at a time
the foundation correlates to childhood memories, eye level might be early 20s, second floor is 40s, the attic is 60s and the roof is a few weeks ago
then alzheimers comes in like a hurricane and rips off the roof, and the attic and next thing you know, the patient is back in thier 40s
now, here is the curveball, my inlaws moved to the US in the mid 90s, when she was in her 50s
that means that all her knowledge of the english language is stored top of the second floor, just under the attic...which most days isnt there any more
