What happens to your writing when AI writes it for you
Researchers have a name for it now, and it is not the one the headlines used.
The study
MIT Media Lab ran 54 adults through four months of essay writing. One group used ChatGPT, one used a search engine, one used nothing. EEG measured what their brains were doing while they wrote.
The ChatGPT group showed the weakest neural engagement of the three. When the assistant was taken away, their brain connectivity stayed low — and they could not reliably recall essays they had written themselves.
The paper calls the effect cognitive debt.
Kos'myna et al., Your Brain on ChatGPT: Accumulation of Cognitive Debt when Using an AI Assistant for Essay Writing Task — MIT Media Lab.
Why we do not call it “brain rot”
That phrase came from headlines, not from the paper. The lead researcher has asked people not to use it for this work, because the study does not support that claim.
We are pointing this out because it is the exact move NIBB exists to teach people to catch: borrow a source, then state a stronger conclusion than the source did. A product that teaches that should not do it in its own copy.
What the finding does and does not say
It does not say AI makes you stupid. Later work suggests the effect depends on when you reach for the tool — bringing AI in after you have worked through the material behaves very differently from starting with it.
The plain reading is narrower and more useful: the part you hand over is the part you stop practising. That is not a claim about AI. It is a claim about practice, and it has been true of every skill anyone has ever had.
So what do you do about it
Keep one thing you do without help. It does not have to be much — it has to be regular, and it has to be hard enough that you notice.
NIBB is one shape that can take. Ten minutes. One prompt, the same one everyone on earth gets that day. It does not fix your sentences. It shows you where a reader snags, and what reading level your writing came out at. Lower is better, because clear thinking gets shorter.
Where people get stuck
Skip it and start at the second. The opening writes itself once the rest exists.
Delete every line anyone could have written. What is left is yours.
Pick one. A single idea taken all the way beats ten touched lightly.