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Use Brain control Walkman's speaker volume.

Discussion in 'Electronic Design' started by Ding, Oct 29, 2004.

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  1. Ding

    Ding Guest

    Hi all

    I wanna build a ciruit for brain to control Walkman speaker volume (by
    the busy level of logical thinking, more logical thinking, smaller
    volume, vice versa)

    I tried EEG b4, but it's not user-friendly (need gel).

    So i changed the approach to use near-infrared red (NIR)
    http://www.acad.polyu.edu.hk/~02471629d/nir.pdf to capture the status
    of brain.

    It has features of noninvasive, no interferece with EMG, ECG, and the
    most important, no need gel.

    What i wanna ask is that:

    1. Is it really possible to measeare busy level of logical thinking by
    just using NIR ?

    2. If it's possible, what position of NIR should i place ? (for hand
    movement imagination, it should be put on C3 of 10-20 EEG system, how
    about logical thinking ? on the frontal side ?)

    3. Any substitute of Hamamatsu C5460-01 (NIR sensor) and 700nm/800nm
    LED (NIR emmitter). I found that it's quite difficult to buy them in
    Hong Kong. Also, i suspect they are expensive. Any other cheaper
    substitutes ?

    Thank very much for help.
     
  2. Ban

    Ban Guest

    I have been working for this company
    http://www.think-a-move.com/products.html
    and we can differentiate between different thoughts to move the mouse or
    drive a wheelchair. This technology has been developed from secret Russian
    experiments. We use a DSP with LMS-filter algorithms to detect the
    individual thinking patterns, which are sensed by very low frequency
    electret mikrophones in the ears. The blood pressure will give certain
    distinguishable patterns. You have to train yourself and the adaptive
    filters for abour two days, then you can use many different commands.
    http://neohio.craintech.com/cgi-bin/article.pl?articleId=3808
     
  3. You can only detect very non-specific activity like hand movement or
    the thought of a hand movement via C3 or C4. This approach has a long
    way to go to be a consideration now.
    C3 and C4 are not only ideal for motor sensory pick up but they are
    the ideal locations for cognitive function generally and by default
    are the two lowest noise parts of the 10/20 system. Of course the ear
    lobes A3 and A4 are the absolute lowest in noise but you wont find
    much EEG there!
    There are dozens of other detectors that will work but unless you are
    well versed in electro-optics you have a challenging road ahead. Just
    the slightest movement of the source or detector inrelation to their
    focal point on the head will result in artifacts that will require
    filtering to get any reliable S/N ratio.

    Furthermore all of the tests that I know of in this area have been
    conducted in temperature controlled labs with the subject in a very
    subdued state. One could assume that the same subject with all this
    equipment tethered to him, walking on a treadmill or doing something
    that will change his heart rate and blood pressure like real life will
    have a dramatic influence on this approach rendering it impractical
    for any other application beyond helping the incapacitated with wheel
    chair control or such. In other words if you are not funded and are
    doing this on your own dime be prepared for some long hours and lots
    of money to get beyond academic level proof of concept.

    I have been looking for alternatives to paste, saline, and electrodes
    for a long time in neuro-cognitive work and have found none.

    Pre-cognitive hand movement detection goes back to the 60's and was
    perfected by Dr. John Ertl in Canada. I have boxes of his works but I
    don't know how much is available on the web.
     
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