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  • Using the Psychtoolbox to interface with a graphics tablet

    Hi all

    I emailed the list about 6 months ago enquiring about solutions for
    using a graphics tablet as a 2D motion tracking system. No one had any
    solutions but I did get a lot of people asking for anything I found out,
    so here's what I found.

    Mario Kleiner, the developer for the Psychtoolbox
    (http://psychtoolbox.org) coded a quick and dirty solution for me that
    allows me to interface with the Wintab driver via Matlab. I've been
    using this code with great success for about 6 months. The basic
    solution is incorporated into the Psychtoolbox, and entails opening a
    'Screen', attaching the tablet to that PTB object, and then pulling data
    from the event queue. This queue can buffer about 500ms of data, give or
    take, which is useful for recording kinematics while simultaneously
    running another process (e.g. stimulus display). You can also pull data
    out in real time (the Wacom tablet I have manages 100Hz but I think the
    latest ones are good for at least 200Hz).

    I've posted a message to the PTB Yahoo forum here:
    http://tech.groups.yahoo.com/group/psychtoolbox/message/9182

    The files I mention are also hosted on my personal filespace, at least
    until May:
    https://files.warwick.ac.uk/andrewdwilson/files/TabletDemos.zip (7.5
    meg)

    This file is larger because it contains some demo Matlab code, the brief
    documentation plus a copy of the Wacom tablet driver.

    I'm happy to keep updating the documentation with questions and
    solutions contributed by other people, although I'm likely to do this
    mostly via the PTB forum just because this Matlab mex file requires the
    PTB. I heartily recommend the PTB and Matlab for stimulus generation and
    data analysis anyway, I've made two full suites of experimental software
    using these with great success.

    Enjoy, and tell all your friends. There seems to be a lot of dusty
    tablets in labs around the world that need to be used, if the response
    to my earlier request is anything to go by Feel free to contact me
    with questions or suggestions for the documentation and if this sees a
    lot of use I'll post any updates to the list.

    -andrew


    ***********************
    Dr Andrew D. Wilson
    Department of Psychology
    University of Warwick
    Coventry, CV4 7AL
    UK

    ph: +44/0 24 761 50485
    fax: +44/0 24 765 24225
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