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The Audeo picks up neurological signals (This is not true. It measures muscle activity. See below.) that are sent to the muscles of the vocal cords. These are purely control signals, which mean that a person has to activate these signals physically for the system to actually pick it up.
A person has to produce control signals that activate the muscles, in order for The Audeo to work (Again, quite vague. Why not leave out part of this sentence and make it clear what this device actually measures: 'A person has to activate muscles'. That's all it does. I don't know why they keep mentioning words like 'neurological signals' and 'control signals'). For example, if you try to move your tongue up and down, or your throat forward, muscle contractions will occur in the laryngeal muscles, which in turn will produce the required signal. With some practice, a user can intentionally produce these same signals without any visual indication of activity.
It is not enough for a user to just ‘think about speaking’. The user has to produce some physical signal which is what we term as a control signal. There are different examples of producing this control signal, two of which are mentioned above. Another easy way to produce a signal is to swallow. This helps a user to initially learn how to produce a signal. To start with this might be an easy enough method, but going down the line this is not the best way for continued use."
So @bciuser : First, see if you can see a difference between rest and actual speech. Then: Compare actual speech with the 'nose'-speech I described (this is what you'd use with a subvocal communication device). They should theoretically give you a similar signal. Of course, it might be difficult to get a good signal from the neck, since your neck muscles are constantly firing to balance your head. Maybe try to rest your head on something like they often do in EEG research and see if that improves your speech signal. Also, visual inspection might not make it clear whether two conditions give different or similar signals. You might need to average over many trials... And after doing that you may find that the signal wasn't good enough to distinguish between rest and speech conditions and you will have wasted your time.. Electrode quality might simply not be sufficient to measure the muscles dedicated to speech.I wouldn't expect any good results. The people at NASA probably have some of the best equipment available and it took them years to distinguish a handful of phonemes.