The planarian worm possesses the incredible ability to regenerate its body parts. Even after decapitation, the worm’s head can regrow a tail, while its tail can grow a new head. This led biologist Michael Levin to wonder if intelligence is not solely confined to the brain but distributed throughout the body’s cells. His research on planaria and other organisms suggests that cells have the capacity to store information and act on it. Levin’s findings on bioelectricity and cellular communication have significant implications for understanding cognition and could potentially be used in fields like medicine to treat cancer and regenerate organs.
https://www.scientificamerican.com/article/brains-are-not-required-when-it-comes-to-thinking-and-solving-problems-simple-cells-can-do-it/