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Motion Capture Lab

The Motion Capture Lab allows for combined motion capture, high density electroencephalographic recordings (EEG), as well as eye movement recordings in freely moving human subjects who are able to actively explore texture-rich, immersive virtual realities.   Mocap VR
 
     

A 24 camera Impulse System (PhaseSpace, Inc.) monitors the subject's movement of the limbs, head, and body in 3-D space with a sampling rate of 240 Hz.

  PhaseSpace
     

Visual input is provided by a xSight panoramic head-mounted display (Sensics, Inc.) featuring a total of 12 monitors (refreshing rate: 60 Hz).

The virtual reality itself is created by the Vizard software platform (WorldViz, Inc.). Vizard also allows to control the subject's interactions with the environment.

  HMD
     

The subject's skeleton can be mapped to a computer avatar using Motion Builder (Autodes, Inc.), which computes the inverse kinematics of the subject's movement, passes the inverse kinematics to Vizard (Worldviz, Inc.) which then renderes the animated character in the virtual environment.

Further, WorldViz's Intersense inertial sensor mounted on the head-mounted display provides informaiton on the actual head orientation of the subject.

  MotionBuilder
     

EEG experiments in our lab utilize a 70-channel Biosemi active electrode EEG system (sampling rate up to 1048 Hz). In order to allow free motion in space, the system's ActiveTwo AD-box has a battery power supply with a fiber optic link to the data recorder.

  eeg
     
Natural environments contain a wide variety of sound sources. In order to simulate these settings, we can present spatial sound with an array of 20 speakers (+ subwoofer), centrally controlled by a sound server that is further connected to Vizard.   speaker
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