Electromagnetic articulography (EMA) is a technology used to record the movements of various articulators including lips, jaw, tongue during various speech and non-speech activities. The electromagnetic articulograph AG501 ( Carstens Medizinelec-tronik, Lenglern, Germany) is currently the most developed three-dimensional (3D)-EMA system. AG501 has 24 channels which measure the horizontal, lateral and vertical displacement of the sensors as well as their angular orientation in terms of azimuth and inclination. For recording articulatory movement using AG501, sensors are glued on the articulators of interest. Typically, for recording speech related articulatory motions, sensors are attached to several articulators on the midsagittal plane outside oral cavity.

A motion capture system or MoCap as it's generally called, is a system which tracks the 3D positions of several reflective markers attached to a subject. This technology has a wide variety of applications, from 3D animation for movies to gesture analysis. Optitrack is an industry leader providing various MoCap and 3D tracking products. The product specialized for facial motion capture consists of 7 Flex IR cameras system and the Arena software. The reflective markers can be attached to custom positions on the face or according to some pre-specified Optitrack templates. The system tracks the 3D x, y and z positions of each marker at 120 frames per second.