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They use 250 ECG electrodes as input. I think that means it's above the skin, so not invasive.

You are mistaken. They use ECoG which is intracranial electroencephalography. These are electrodes placed on exposed surface of the brain. https://en.wikipedia.org/wiki/Electrocorticography

Thanks for the info!

I dearly hope this is the case. Even if it were expensive to rig up, being able to not use my hands for computer work would really help( I have RSI).