alt Hacker Newsdo you want a reference from a published journal or something? links to my last mri? how do you want me to answer this?
bring some empirical evidence that using ai rots the brain, and in the meantime, i will think about whether or not its worth trying to answer your request in earnest.
There is no way for you to know that you aren't slightly less sharp having offloaded the memorization of those phone numbers. Who is the judge? It's a nonsensical question from a scientific perspective because it's impossible to prove either way.
We could speculate that simple acts like memorizing phone numbers probably do make the average person slightly sharper, in a similar way to trivial brain games helping to stave off alzheimer's.