MEMORY TRACES. “Worms that had regenerated from headless fragments from original familiarized worms displayed significant shorter feeding latency compared with unfamiliarized worms, suggesting that memory of the original environment was not located exclusively in the brain, and had become imprinted onto the newly built brain during regeneration. In the past, such results have been received with skepticism.”
http://jeb.biologists.org/content/216/20/3799