Discover octopuses' 9 brains
About this idea
Learn about one of nature's most extraordinary cognitive systems: octopuses have a central brain plus one in each of their eight arms, allowing independent problem-solving. It takes only a few minutes of marine biology to meet an intelligence this alien without leaving Earth.
On this page
How to get started
STEP 1
the basic facts (3 minutes)
- Octopuses have one central brain in their head
- PLUS one mini-brain (ganglion) in each of their eight arms
- That's 9 total brains working together!
- Each arm has about 40 million neurons (humans have 86 billion total)
- Arms contain 2/3 of the octopus's total neurons
STEP 2
what this means (4 minutes)
- Each arm can:
- - Taste what it touches (chemoreceptors on suckers)
- - Feel textures and shapes independently
- - Solve problems without asking the central brain
- - Reach and grasp while the central brain focuses elsewhere
- Example: Central brain spots food, one arm investigates while others keep hiding
- Cut-off octopus arm continues moving and reacting for hours!
- Like having 8 semi-autonomous assistants
STEP 3
incredible abilities (3 minutes)
- Open childproof caps and jars
- Use tools (carry coconut shells as armor)
- Mimic other sea creatures
- Squeeze through tiny holes (only hard part is beak)
- Change color and texture in milliseconds
- Recognize individual humans and remember faces
- Each species seems to have different personality types
STEP 4
bigger questions (2 minutes)
- Octopus intelligence evolved completely separately from vertebrates
- Their last common ancestor with us was a simple flatworm 600M years ago
- Proves intelligence can evolve along totally different paths
- Their intelligence is truly 'alien' - distributed, not centralized
- What would YOU do with 9 brains?
- How would it feel to think with your hands?
What you’ll need
- none
Recommended resources
Tutorials & Learning
Progress milestones
Track your progress with these key achievements:
1
5 minutes
Understand 9-brain system
2
10 minutes
Grasp independent arm intelligence
3
12 minutes
Contemplate alien intelligence
Common challenges
Every beginner faces obstacles. Here's how to overcome them:
Hard to imagine distributed intelligence
Solution: Think of it like a company: CEO (central brain) sets direction, but departments (arms) handle details independently. Or like playing piano - your fingers work semi-independently.
Share your progress
Celebrate your achievements and inspire others:
- • Share this amazing fact with marine life enthusiasts
- • Watch octopus intelligence videos
- • Discuss what consciousness might mean for such different minds