Gladly, though tonight I have to write 5 more letters of recommendation. Have one for now, and I'll edit this when I have time. (I have edited in some more). Hopefully this one, the most damning in my opinion, shows how the vast majority (80%) of low-skill users will inevitably choose to become so cognitively reliant on AI that their performance will not only fail to improve, but actively deteriorate, making it impossible to become the sort of expert user necessary to actually use LLMs without the pitfall.
The Generative AI Learning Penalty: Evidence from Chinese Secondary Education
Hopefully that tides you over until I have more time to find the other studies I read!
Edit: here's another which is more qualitative, but no less damning:
AI Tools in Society: Impacts on Cognitive Offloading and the Future of Critical Thinking
I also can't help but point out my second-favourite AI study, Vending Bench, which shows how an LLM will, for no apparent reason, decide to threaten nuclear annihaltion over an hallucinated error in shipping. LLMs are not expert systems. They cannot be experts. LLMs cannot consistently operate without constant expert oversight, even for something so simple as stocking a fucking vending machine.