Many people assume that memory belongs only to the brain, but recent findings suggest this idea may be too limited. Research conducted at New York University indicates that certain ordinary human cells outside the brain are also capable of learning and retaining information.
Cells exposed to learning-like signals behaved similarly to neurons, showing stronger responses when stimulation was spaced over time rather than delivered all at once.
Memory May Be a Universal Property of All Cells
According to Nikolay V. Traditionally, learning and memory have been linked only to the brain, but the study shows that other body cells can also form memories. This suggests that learning may be a fundamental property of life, built into how all cells process time and information.
The finding is based on the spacing effect, identified by Hermann Ebbinghaus in the 19th century, which shows that information is remembered better when studied over time rather than crammed. It has been observed across species from humans to sea slugs and was long thought to depend on neural activity.
How Scientists Examined Learning in Ordinary Human Cells
To test whether the same principle extends beyond the brain, Nikolay V. Kukushkin and his team used nerve and kidney cells engineered to glow when a CREB-regulated memory gene was activated. CREB, a molecular switch for long-term memory in neurons, is also found in most cells in the body.
The researchers then tested the cells by exposing them to short bursts of chemicals that imitate the brain’s learning signals. Each burst lasted just three minutes, with the signals delivered either at spaced intervals or in one continuous session.
The results were striking. Cells that received the signals in spaced intervals glowed more intensely and remained active for a much longer time. The memory gene stayed active for hours after stimulation, with the strongest response when pulses were spaced ten minutes apart. By comparison, when the same total stimulation was given all at once in a massed pattern, the glow diminished rapidly.
Cells given four spaced pulses showed 2.8 times higher activation of a CREB-regulated memory gene after 24 hours than those given a continuous signal, suggesting they can store the timing and rhythm of stimulation rather than just its total amount.
Spaced Repetition May Be a Universal Cellular Principle
According to Nikolay V. Kukushkin, this demonstrates the massed-versus-spaced effect in practice. He said spaced repetition learning may not be limited to brain cells, but could be a fundamental feature of all cells.
The experiment produced the same outcome in both nerve cells and kidney cells. Even after 24 hours, the cells still “remembered” the earlier pattern of stimulation because certain molecular switches remained changed.
Kukushkin further noted in an interview with IFLScience that this ability is likely not specific to any one cell type, but rather a universal characteristic shared by all cells.
If this idea holds true, it suggests that memory may not depend on the brain alone. Rather, it could represent a universal biological mechanism through which cells detect and preserve patterns over time in their surroundings, whether within a neural network or the bloodstream.
What Cellular Memory Could Mean for Future Medicine
Nikolay V. Kukushkin suggested that future medicine may need to approach the body more like the brain. For example, the pancreas may “remember” past meal timing to help regulate blood glucose, while cancer cells may retain information about previous chemotherapy exposure.
This perspective could have major implications for medicine. If cells retain memories of past exposure to nutrients or drugs, then the timing of treatments or meals may be as important as their content or dosage. Kukushkin also suggested that the order and spacing of nutrients could affect digestion, fat storage, and future nutrition strategies.
The NYU study shows that even simple cells can encode time and store traces of past experience through molecular memory systems. While they don’t remember complex events, they can recognize patterns and adjust their responses when re-exposed. As Kukushkin concluded, non-neural cells may be far more sophisticated than previously assumed.
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