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    Electromagnetic tracking of motion in the proximity of computer generated graphical stimuli: a tutorial

    Schnabel, U.H. and Hegenloh, M. and Muller, Hermann J. and Zehetleitner, M. (2013) Electromagnetic tracking of motion in the proximity of computer generated graphical stimuli: a tutorial. Behavior Research Methods 45 (3), pp. 696-701. ISSN 1554-3528.

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    Electromagnetic motion-tracking systems have the advantage of capturing the tempo-spatial kinematics of movements independently of the visibility of the sensors. However, they are limited in that they cannot be used in the proximity of electromagnetic field sources, such as computer monitors. This prevents exploiting the tracking potential of the sensor system together with that of computer-generated visual stimulation. Here we present a solution for presenting computer-generated visual stimulation that does not distort the electromagnetic field required for precise motion tracking, by means of a back projection medium. In one experiment, we verify that cathode ray tube monitors, as well as thin-film-transistor monitors, distort electro-magnetic sensor signals even at a distance of 18 cm. Our back projection medium, by contrast, leads to no distortion of the motion-tracking signals even when the sensor is touching the medium. This novel solution permits combining the advantages of electromagnetic motion tracking with computer-generated visual stimulation.


    Item Type: Article
    Keyword(s) / Subject(s): electromagnetic motion-tracking, back projection setup, measurement accuracy, experimental setup
    School: Birkbeck Faculties and Schools > Faculty of Science > School of Psychological Sciences
    Depositing User: Sarah Hall
    Date Deposited: 27 Oct 2015 10:50
    Last Modified: 02 Aug 2023 17:19


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