The lead researcher on this study has a note on her project page asking people to stop using words like "brain damage," "brain rot," "harm," "destroy," and "collapse" to describe her findings. This tweet is doing exactly what she asked people not to do. Here's what they actually tested. 54 people wrote SAT essays over 4 months. One group used ChatGPT, one used Google, and one used nothing. Researchers tracked brain activity continuously with EEG caps. The ChatGPT group showed the weakest brain connectivity. By session three, most were just pasting ChatGPT's output. 83% couldn't quote a single sentence from the essay they'd just "written." Two teachers who graded the essays called them "soulless." That part is real. But session 4 changes the picture. They swapped the groups. ChatGPT users had to write solo. Brain-only users got ChatGPT for the first time. The brain-only group's neural activity actually went up when they used ChatGPT. Their brains treated it as a collaborator, not a crutch. Three sessions of thinking independently meant they had something to bring to the table. The paper is a 206-page preprint. Still not peer-reviewed. A formal academic response in December 2025 flagged issues with the sample size, EEG methods, and the reporting of results. This pattern isn't even new to AI. A 2011 Columbia study in Science found people who knew they could Google something were less likely to remember it. GPS users show steeper declines in spatial memory over time. Calculators, cameras, even writing itself. Every tool humans have built changes what our brains bother to store. The actual finding: passive, copy-paste use of ChatGPT during essay writing reduced brain engagement over 3 sessions in 54 college students. People who already knew how to think independently used ChatGPT without losing anything. The researcher's own term is "cognitive cost," not "cognitive destruction."