A new study from the MIT Media Lab has raised concerns that heavy reliance on artificial intelligence (AI) tools could weaken cognitive engagement and critical thinking skills.
The yet-to-be-published research, led by research scientist Nataliya Kosmyna, explored how using Large Language Models (LLMs) affects brain activity during writing tasks. The findings suggest that excessive dependence on AI tools such as ChatGPT may lead to reduced mental effort and creativity over time.
How The Study Was Conducted
To understand the neurological effects of AI-assisted writing, researchers recruited 54 students and divided them into three separate groups for an essay-writing experiment.
- The first group used ChatGPT to help write essays.
- The second group used a search engine such as Google Search, but without AI-generated summaries.
- The third group completed the task entirely without using technology.
Researchers monitored participants’ brainwaves throughout the exercise to measure how different tools influenced cognitive engagement.
The results showed a striking difference in brain activity among the three groups.
Brain Activity Dropped Significantly In AI Users
Students who wrote essays without any technological assistance displayed the highest level of mental engagement. Their brains showed widespread activity across multiple regions, which researchers described as being “on fire.”
Participants using traditional search engines mainly activated their visual cortex, likely due to reading and scanning information.
However, the ChatGPT group recorded significantly lower overall brain activity, with reductions of up to 55 percent compared to those who relied on their own thinking.
Kosmyna explained that while the brain did not completely disengage, there was noticeably less activity in regions associated with creativity and information processing.
“The brain didn’t fall asleep, but there was much less activation in the areas corresponding to creativity and to processing information,” she noted.
Long-Term Learning Concerns Raised
Researchers observed participants over a four-month period, during which those who frequently used AI tools consistently underperformed across neural, linguistic, and behavioural metrics.
According to the study, while LLMs offer convenience and speed, they may also carry hidden cognitive costs.
The research team emphasised that these findings could have significant implications for education systems and workplace practices.
Schools and universities may need to strengthen activities that promote critical thinking, creativity, and independent problem-solving to counterbalance the potential downsides of AI reliance.
AI Use Linked To ‘Cognitive Offloading’
The MIT findings align with earlier research linking heavy AI use to reduced critical thinking.
A separate study titled “AI Tools in Society: Impacts on Cognitive Offloading and the Future of Critical Thinking,” published in the journal Societies, found that frequent AI users tend to delegate memory and problem-solving tasks to technology — a phenomenon known as cognitive offloading.
Lead author Michael Gerlich from SBS Swiss Business School reported that younger participants who depended heavily on AI tools scored lower on critical thinking tests compared to older participants.
Some participants also admitted feeling uneasy about their growing reliance on AI.
What This Means For The Future Of AI In Education
As artificial intelligence becomes increasingly embedded in classrooms, workplaces, and daily life, experts warn that careful balance will be essential.
While AI tools can improve efficiency and accessibility, the study highlights the importance of maintaining strong analytical and reasoning skills.
Policymakers and educators may need to rethink teaching methods to ensure that technology enhances learning rather than replacing independent thought.
The researchers concluded that more long-term studies are needed to fully understand how sustained AI use may shape cognitive abilities in the future.