Motion capture as a technique is most commonly used for special effects in movies and rehabilitation diagnostics at hospitals. However, this technique has found its way into domains such as cognitive science and linguistics. After attaching small markers to parts of the body, several smart motion tracking cameras can watch the markers and communicate with each other. The information they provide from several angels is synchronized allowing us to build a 3D-world where the markers move in 3D trajectories. The measurements are accurate to the centisecond and at the millimeter level. The technique enables us to quantify movements in real space, for example fingers reading braille text or speech-accompanying gestures. In gesture analysis, for example, precise measurements of movements in space and time open new ways to study the details of speech-gesture coordination in human speech production and comprehension, and to model them in virtual agents, combining motion capture with virtual reality.