[intrasight]

Several years ago, I was on a long solo drive and thinking about how I would like to be able to communicate with my computer in a subvocal manner. I stuck my pinky finger in my ear canal and "listened" to the deformations of the canal as I spoke, and thought "with a deformation scanner and good machine learning, this could totally work". Later, I registered the domain silentbuds.com to trial the idea but never pursued it. Just did some Googling and see that there are a few new research papers on this approach.