I work at CTRL-labs, a startup focused on electromyography (EMG) based control devices. This article has a bit more technical detail about what we do: https://www.wired.com/story/brain-machine-interface-isnt-sci...

EEG--reading signals from the brain--is pretty hard. But EMG--capturing muscle contractions in the arm--produces relatively much cleaner data. This can then be fed into a variety of machine learning algorithms to map high-fidelity time series data to discrete signals or continuous gestures for which we have appropriate training data.

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