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MIT Researcher Creates Mind-Controlled Internet Search Headset
(www.unilad.com)
This is a most excellent place for technology news and articles.
IIRC, when you think about words, you also emit weak signals to your face like if you were actually pronouncing those words, but too weak to actually activate your muscles..
This device would pick up those signals.
EDIT: not saying this thing works, but the principle is valid.
Shame on me. It's a jaw controlled interface. Like speech. Not brain controlled like... telepathy.