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This animal has many brains, not just one

it's got a big central brain and then a mini one in each arm!

By Smartasaurus· 1 min read Wild

Imagine an arm that's been separated from its body

Scale check

Gut call — how extreme does this actually get?

Reality tends to overshoot. Pick your ceiling.

The short version
  • it's got a big central brain and then a mini one in each arm!
  • This distributed intelligence allows the octopus to multitask in ways humans can't process.
  • Even more unsettling is that the central brain often doesn't know exactly what the arms are doing until it sees the results.

If you cut off a human arm, it stops moving. If you cut off an octopus arm, it will continue to crawl around and try to grab food for several hours.

This happens because two-thirds of an octopus's neurons are located in its arms, not its head. Each limb has its own mini-brain that can make decisions without waiting for a signal from the central nervous system.

An octopus doesn't have to 'think' about moving an arm. The arm tastes the water and feels the texture of a rock entirely on its own. While the central brain might decide to hunt, the arms decide exactly how to untie a knot or open a jar.

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