I have a wild theory, and it has made sense to a few folks I've shared it with.
We assume our brain can store information, not in the way a computer does, based on what lines cause our brain to assemble an image, or how we can juggle the letters of a word around and still have it perfectly readable.
But what if there is nothing stored in our head?
What if our brain was nothing more than a Transceiver?
Everything we see or think gets transmitted. Unimportant things are transmitted at low power, and important things at high power, and traumatic events at super high power.
The transmitted signal loses power each revolution around the earth, so if we don't recall a memory, and retransmit it, it could possibly be lost, unless something queues the receiver to listen harder for a weaker signal.
If our thoughts are our soul or spirit, and our brain works like a transceiver, they could be out there forever, just getting weaker.
Each person has a frequency all their own.
Such could also explain why twins, or mothers often know and feel what their sibling or child is doing.
It would also explain why some folks think they have ESP. Their frequency could be right next to someone else's frequency, and they have the ability to adjust their receive frequency up or down a small amount to pick up other neighboring peoples thoughts.
Some college tried an experiment once based on the above info, by using a lead lined building with several lead entrances one after the other. Since I don't have the college or their data on hand anymore, I can't prove what they did.
Basically, they had a person go through all the doors, read a short book and write a book report.
Then leave the main room to the next foyer on the way out, and write another book report.
By the time they got through all four doors, they couldn't write an accurate book report.
I always thought that was interesting. Considering at the time, they thought our thoughts stayed around our head like it was the nucleus of an atom.