Harry currently thinks that Atlantis is some form of system that locks onto human bodies with the Blood Of Atlantis gene and detects their commands (spells, odd potion-making actions, etc).
A simple explanation for Horcrux is that it is basically a form of uploading. Although that would make it seem overly simple for Sufficiently Creative Harry to find a way to make horcruxes without human sacrifice.
Alternatively, a wizard's soul has read-only access to their brain.
I'm not claiming that recoverable info-containing souls are a completely crazy outlandish hypothesis; I merely claim that Harry is nowhere near having enough support for this hypothesis to stake Hermione's life on it being true.
This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 88-89. The previous thread has passed 500 comments.
There is now a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author’s Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)
The first 5 discussion threads are on the main page under the harry_potter tag. Threads 6 and on (including this one) are in the discussion section using its separate tag system. Also: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18.
Spoiler Warning: this thread is full of spoilers. With few exceptions, spoilers for MOR and canon are fair game to post, without warning or rot13. More specifically: