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Do you still have the ability to lie with an implant like this? That’s a pretty crucial part of human communication, ie “not” saying precisely what comes to mind. I know we’re talking multichannel DSP engineeringwise but I don’t know neurosciencewise what differentiates “id chatter” and “conscious intentional thought.”
It sounds to me that this current form is very much under concious control of the user. They're reading what would be the signals that direct the muscles of the mouth and the vocal chords.

So lying should be no harder than for a person with normal speech abilities.

(I have no expert knowledge in this area, this is just what I'm understanding from the article)

I read it the same way. The signal analysed comes from the sensorimotor cortex, so this is less “words you are thinking of” and more “words you are attempting to speak”.