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Looks like a good approach and the error rate of 3% is really good, I guess. Did they mention how they got the input data? I couldn't find it.

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

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).

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!