A system for providing a sound-based sensing of subjects comprising a network (10) of network devices (100) configured to perform a sound-based sensing. The network devices (100) are distributed in a sensing area (20) and communicate with each other based on RF signals. At least one network device (100) comprises a sound generator (120) to generate a sound signal (100) and/or a sound sensor (130) to detect the sound signal (101) from the sound generator (120) after a propagation through at least a portion of the sensing area (20) and to generate a sensing signal indicative of the detected sound signal. The sound generator (120) and the sound sensor (130) are arranged in different network devices (100). A sitting position detector (200) detects a sitting position of a subject in a sensing area based on the sensing signal from the sound sensor (130).

A system having a skull tracking bracket; a mandible motion tracking bracket; a motion detecting camera; an electromyography sensors adapted to detect and measure facial muscle activation data and transmit the data to the computerized controller; an audio sensor carried by the subject and adapted to detect and measure sound data associated with jaw (and joint) movement data and transmit the data to the computerized controller; a bite force sensor adapted to detect and measure static and dynamic bite force data; a pain push-button switch (or other sensor) adapted to be activated by the subject when experiencing pain; and a computerized controller is adapted to receive motion data, facial muscle data, joint sound data, static and dynamic bite force data, pain data, and received a set of three-dimensional images of the subject, overlay the detected motion with the three-dimensional image and display the overlay.