how many different motor imagery 'movements' can be discriminated by the Ultracortex headset?

lpmlpm Oregon, US
edited January 2019 in General Discussion
What is the approximate number of motor imagery movements that can be identified using the Ultracortex "Mark IV" EEG Headset?

Thank you.

Comments

  • BillhBillh
    edited January 2019
    Almost any motor imagery will cause a small drop of amplitude in the scalp recorded EEG on the middle opposite side of the head. So, the number of such may be pretty arbitrary.

    More important is the question of how many different movement types can be reliably discriminated between. That in turn depends on how reliable the discrimination between imagery types needs to be. So it depends. 

    With a good subject and lots of training, IMO one might expect to tell apart each hand and each foot movement visualizing about 3/4 of the time. This is not just a limitation of the MIV headset versus another headset.

  • lpmlpm Oregon, US
    Yes, you are correct. What I should have asked was how many different movement types can be reliably discriminated between.

    In
    the example of someone using a BCI headset and flying a small
    drone/helicopter, would you say the number of different movements types
    discriminated are at least six?
      * up / down (z axis)
      * left / right (x axis)
      * left / right (y axis)
      * slow / fast (speed?)

    If yes, are these six movements able to be reliably reproduced?

    Thanks very much
  • wjcroftwjcroft Mount Shasta, CA
    Lpm, hi.

    One obvious caution with a drone, is that when the classifier makes the inevitable mistake, drones flying into humans or other objects would be extremely unpleasant.  ;-)



    The fact that this system only uses two dimensions, implies that discriminating more parameters is hard,


    Regards,

    William

  • BillhBillh
    I would say that six parameters (maybe visualizing moving the face, arm and leg?) would be very, very hard to do with sufficient reliability to control a drone. Why not try it with two (left, right) and add more axes if the left versus right works out?

  • BillhBillh
    This supplemental material tells you what electrodes and frequency bins were used for controlling a drone on two axes in this article:


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