From Newsgroup: sci.misc

New Brain Device Is First to Read Out Inner Speech

A new brain prosthesis can read out inner thoughts in real time,
helping people with ALS and brain stem stroke communicate fast and
comfortably
...
Using this new "inner speech" system, the participants needed only to
think a sentence they wanted to say and it would appear on a screen in
real time. While previous inner speech decoders were limited to only a
handful of words, the new device allowed participants to draw from a
dictionary of 125,000 words.
...
...
Like most BCIs that translate brain activation into speech, the new
technology only works if people are able to convert the general idea
of what they want to say into a plan for how to say it. Alexander
Huth, who researches BCIs at the University of California, Berkeley,
and wasn't involved in the new study, explains that in typical speech,
"you start with an idea of what you want to say. That idea gets
translated into a plan for how to move your [vocal] articulators. That
plan gets sent to the actual muscles, and then they carry it out." But
in many cases, people with impaired speech aren't able to complete
that first step. "This technology only works in cases where the 'idea
to plan' part is functional but the 'plan to movement' part is
broken"--a collection of conditions called dysarthria--Huth says.

https://www.scientificamerican.com/article/new-brain-device-is-first-to-read-out-inner-speech/
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