ULTRASOUND-BASED FACIAL AND MODAL TOUCH SENSING WITH HEAD WORN DEVICE

A method, a device, and a non-transitory storage medium having instructions to analyze a characteristic of an ultrasonic signal that propagated on a face of a user of the computational device and effected by an on-body touch, by the user, in an area in which the ultrasonic signal has propagated, wherein the characteristic includes at least one of facial expression or contraction state of a facial muscle; select an input based on an analysis of the ultrasound event; and perform an action specified by the input.