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Research from the MIT Media Lab suggests that using ChatGPT to write essays may lead to lower brain engagement and memory retention compared to traditional writing methods.
The study, titled “Your Brain on ChatGPT,” monitored the brain activity of 54 participants as they wrote SAT-style essays using either ChatGPT, a search engine, or no digital tools at all. The researchers used electroencephalography (EEG) to monitor neural connectivity, finding that those who relied on the chatbot exhibited the weakest overall brain coupling and lower levels of executive control.
“The use of [AI] had a measurable impact on our participants,” the researchers noted in the study published as a preprint in June 2025. “The [AI] group’s participants performed worse than their counterparts in the brain-only group at all levels: neural, linguistic, scoring.”
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The findings indicate that the “brain-only” group showed strongest connectivity in the regions associated with memory, semantic processing, and creative ideation. In contrast, the group using ChatGPT produced essays written by the ChatGPT group were described by human graders as “soulless” and statistically similar to one another.
The data from the study also highlighted a significant gap in memory and ownership. Participants using the AI tool struggled to quote from their own work just minutes after finishing it. While 100% of the “brain-only” and search-engine groups could quote their essays by the third session, only 33% of AI-only group could do the same.
The study also explored “cognitive debt” by switching tools in the final session. The group that moved from using ChatGPT to writing manually continued to show weakened neural connectivity compared to those who had never used the tool. The group that moved from writing manually to using ChatGPT saw a boost in brain connectivity, suggesting that the timing when AI is introduced in the learning process may be crucial.
Lead author Nataliya Kosmyna said she released the preliminary findings to alert educators and policymakers to the potential risks of integrating AI too early in education and child development. She expressed concern that overreliance on these tools could interfere with memory processes.
The researchers cautioned that the study is preliminary and featured a limited sample size from the Boston area. They also noted that the findings are context-dependent, focusing specifically on essay-writing within an educational setting.
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