This Flatworm Remembers Things After You Cut Off Its Brain

Planarians are fascinating creatures known for their regenerative abilities. They can regrow their tails and even their heads, retaining memories from before decapitation. Despite their simplicity, planarians have true brains with specialized regions, making them valuable for studying brain evolution and memory. Experiments show they can be trained to perform tasks and retain these memories even after head regeneration. This challenges our understanding of memory storage, suggesting it might occur outside the brain. Further research could reveal insights applicable to human memory and brain injuries.

What unique ability do planarians have that makes them interesting for studying brain evolution?

• They can fly.

• They can regrow their tails.

• They can regenerate their heads and retain memories.

• They can change colors.

How do planarians react when placed in a new environment with a bright light and food?

• They become aggressive.

• They immediately go for the food.

• They are initially hesitant but can be trained to approach the food.

• They ignore the food completely.

What is the duration for which planarians can retain trained behaviors?

• 30 days

• 60 days

• 7 days

• 14 days

What did scientists discover about planarians' memory after they regrow their heads?

• They gain new memories.

• They remember some of their training.

• They lose all previous memories.

• They become more intelligent.

What is one theory about how planarians retain memories after losing their brain?

• Memories are stored in their tails.

• Memories are transferred to neural tissue outside the brain.

• Memories are stored in their skin.

• Memories are lost forever.