From Slashdot:

alex_guy_CA writes “Yahoo News has a story about technology that
comes close to reading thoughts not yet spoken, by analyzing nerve
commands to the throat. ‘A person using the subvocal system thinks
of phrases and talks to himself so quietly it cannot be heard, but
the tongue and vocal cords do receive speech signals from the
brain,’ said developer Chuck Jorgensen, of NASA’s Ames Research
Center, Moffett Field, California. Jorgensen’s team found that
sensors under the chin and one each side of the Adam’s apple pick
up the brain’s commands to the speech organs, allowing the
subauditory, or ‘silent speech’ to be captured. The story indicates
the method could be useful on space missions or other difficult
working conditions.”