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Video (buried in the article): https://www.youtube.com/watch?v=3pv0vT82Cys

at 2 minutes:

they can produce words from brains even when the subject does not speak them. interrogation tool?

No, this approach is not reading thoughts. The video states that they still mouth the sentences which will trigger similar muscle movements which appears to be the target of this method. Without the signals to move the muscles, no intelligible speech should be detectable using this approach.

I mean, we can already read subvocalizations.

What I mean is, when we think about moving our arms the same parts of our brains activate as if we are moving our arms. Maybe, when we think about talking a similar thing happens.

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