Google Glass for the Ears

In Mashable:  We examined audible interaction.  Both internally and with shoppers in retail. Sound and vision have different bandwiths.  Different precision. What are the implications for wearing a sound manipulated device?   A device driven by micro gestures from the ear?  " ... Created by Hiroshima City University staffer Kazuhiro Taniguchi, the prototype device's interface uses infrared waves to detect when the wearer opens and closes his mouth. Those movements send corresponding command signals back to the device. Conceivably, apps could be created for the device that would let you do things like fetch traffic information or get directions by turning your head or biting down. .... "