A study found that flatworms can retain memories after their heads have been severed and regrown. Researchers tested the theory by training flatworms to trust lighted areas, which the species usually avoids, and when the heads were cut off and regrown, the worms remembered they could retrieve food from the lighted areas. "What we do know is that memory can be stored outside the brain -- presumably in other body cells -- so that [memories] can get imprinted onto the new brain as it regenerates," said biologist Michael Levin.

Related Summaries