A growing body of research suggests that heavy use of AI chatbots like ChatGPT, Google Gemini, and Claude may be reducing cognitive effort and weakening certain mental skills.
Researchers have noticed early signs of this shift. Nataliya Kosmyna from MIT observed that students increasingly rely on large language models to write assignments, often producing highly polished but formulaic work. She also noticed students forgetting material more easily than in previous years, raising concerns about how AI use may be affecting memory and learning.
To investigate, Kosmyna and her team conducted an MIT Media Lab study with 54 students writing essays under different conditions: using ChatGPT, using Google search without AI summaries, or using no tools at all. Brain activity measurements showed significant differences. Students writing without tools had the most widespread brain engagement, while the ChatGPT group showed up to 55% lower brain activity, particularly in areas linked to creativity and information processing. They also performed worse on memory recall and often felt less ownership over their essays.
Other research supports similar concerns. A University of Pennsylvania study describes “cognitive surrender,” where users tend to accept AI-generated answers without questioning them. Additional findings suggest that professionals, including doctors using AI for diagnostics, may lose accuracy when later working without it.
Researchers warn that this growing “cognitive offloading” could weaken critical thinking, creativity, and long-term memory. Some even suggest it may contribute to long-term cognitive decline if overuse becomes the norm.
However, experts also stress that AI is not inherently harmful. Used properly, it can enhance thinking rather than replace it. Researchers suggest strategies like using AI to challenge ideas instead of replacing thought, asking it to critique your reasoning, or ensuring you form your own understanding before turning to AI tools.
The key concern is not AI itself, but how heavily people rely on it. Without active engagement, researchers warn, the brain may gradually do less of the work it needs to stay sharp.
