In the people around me I’ve observed:

AI solves the 2-sigma problem when used correctly.

AI is extremely neurodegenerative when used incorrectly.

The people using it as a research assistant to discover quality sources they can dive into, and as a tutor while working through those resources, are getting smarter.

The people using it as an “oracle made from magic talking sand” are getting dumber.

To be fair, the same thing is true of the web in general, but not to the extreme I’ve been seeing with AI.

I’m predicting the bell curve of IQ is going to flatten quite a bit over the next decade, as people shift two sigma in both directions.