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  • friction on a digitizer tablet

    Dear BIOMCH-L Browsers,

    I have a question concerning the friction of a pen on a digitizer tablet
    (Calcomp 9000).
    In an experiment where subjects had to make a precise single fast movement
    from one point to the other, axial pen pressure and velocity were measured.
    A secondary cognitive condition was included. Motor performance of 2 groups
    was investigated. Both groups performed the task at the same speed. Both
    groups reacted on the 2nd condition with a 14 gram raise. However,
    group_1 raised pen pressure from 142 to 158 grams, group_2 from 183 to 199
    gram.

    My question: Is the force increase required to move the pen along the
    trajectory equal for both groups? My hunch is (but that is not scientific)
    that group_2 will need disproportionate more force input -1- because of
    the tablets' elastic properties, the tablet will spring back and the pen
    point is pressed more into the tablet, thus more friction and -2- the
    springing back curve and friction curve are not linear.

    I will post a summary of responses.

    Thanks,

    Gijs Bloemsaat


    __________________________________________________ _________
    Gijs Bloemsaat
    Nijmegen Institute for Cognition and Information
    University of Nijmegen - Dept. of Experimental Psychology
    Room B.01.02
    P.O. Box 9104, 6500 HE Nijmegen, The Netherlands
    Voice +31 (0)24 3612758 Fax +31 (0)24 3616066
    E-mail bloemsaat@nici.kun.nl
    __________________________________________________ __________

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