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The demo in which they were able to read limb position was pretty impressive and shows that they should be relatively close to being able to help people that have lost limb control.

The brain is also quite adaptable and learns via feedback loops so getting the electrodes 'close enough' might be sufficient along with some physical therapy.

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This has been there for a while, it is pretty simple to decipher impulses from the cortex. They are just publicizing years of research from other folks i.e. professor Jose M. Carmena from Berkeley and so on. We need more folks like Elon to publicize science...It is actually great work the team is doing.

It seems like the key advance here is the miniaturisation. Imagine one of these puppies paired up with an advanced prosthetic arm.

The key advance is the increase in order of magnitude and precision of placement of filaments embedded in the brain.

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