The core concept that spaced repetition increases rapidly in effectiveness over time is called the Spacing Effect. There are many many studies that have investigated and proved it
The article links to a paper which estimates how much more effective you get at reading the more knowledge you have. It shows that for most ages you don't improve in this way, but for older ages you do.
Then it says for the "best case" that "adults" takes years to get twice as effective at reading.
If you don't believe this then it means you think it takes adults less than a year to get twice as effective? If effectiveness doubles each year then that would mean by the time a 25 year old becomes 65 that they're 1 million times as effective at reading than when they were 25. Does that sound reasonable to you?
"Proved" is not a word used in any physiological research I've ever been familiar with, at least not with paragraph, if not pages of qualification. Would you please link me to this proof?
Agree, I shouldn't have used the word "proved". But there is a lot of robust evidence for it going back to the 1800s. Many of the studies are linked to on the wikipedia page
The core concept that spaced repetition increases rapidly in effectiveness over time is called the Spacing Effect. There are many many studies that have investigated and proved it