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'biofeedback'
1997\03\22@075747 by richardd

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hi all

does anyone out there know where i can get information on biofeedback
such as monitoring points, waveforms, voltages, temperature and the pic
processor.
i'de like to build a brain wave analyzer with a pic processor that has
an infra red link to my computer can anyone help me in anyway with this
project
thank you
richard

1997\03\22@101915 by Tony Matthews

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richardd wrote:
>
> hi all
>
> does anyone out there know where i can get information on biofeedback
> such as monitoring points, waveforms, voltages, temperature and the pic
> processor.
>  i'de like to build a brain wave analyzer with a pic processor that has
> an infra red link to my computer can anyone help me in anyway with this
> project
> thank you
> richard
I played around with this in high school. You need an instementation
operational amplifier which will give you three leads to subject ,Ground
and the difference electrodes, ground goes to the base of the skull and
the other two electrodes need to be spaced 3" or so apart. I found a
velcro strap would hold all three in place two on forehead one in
back.were talking millivolts here so shielded probes with wet type
(little sponges) electrode's are needed. Converting the information
recieved Ie: four distinct freq bands with varying amplitudes into a
perceptible yet not terribly annoying feedback signal is the second most
important design requirement. Stick with pink noises or single emission
point lights as even an analog needle causes subtle movements of the
head causing electromyographie interference with the
electroencephalographic signals .Have fun Tony M.

1997\03\22@102535 by Customized Controller Solutions

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       My response is to the last request; "Brain Waves".  A magazine
by the name of "Radio Electronics", June of 1973, article dealing with
"Theta Brain Wave Monitor".

       You will probably have a better chance of finding better info
on this subject by searching the internet, using the keywords; "Theta"
and "Brain Wave".

       It's a starting point anyway.  I no longer have this magazine.
I do not know where you could find a copy of the article.

Brent

At 04:57 AM 3/22/97 -0800, you wrote:
{Quote hidden}

1997\03\22@115223 by Leon Heller

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In message <spam_OUT3333D729.7B9ATakeThisOuTspamexplorenet.net>, richardd
<.....richarddKILLspamspam@spam@EXPLORENET.NET> writes
>hi all
>
>does anyone out there know where i can get information on biofeedback
>such as monitoring points, waveforms, voltages, temperature and the pic
>processor.
> i'de like to build a brain wave analyzer with a pic processor that has
>an infra red link to my computer can anyone help me in anyway with this
>project

The IR link is a good idea, as it will ensure that you don't get the
mains connected to your body. Look for stuff on bioengineering and
medical electronics. "Brain waves" are rather tricky; you need silver-
silver chloride electrodes, low-noise connections, high gain
amplification and lots of filtering. I'd start with something relatively
straightforward like heart rate. I did some work on electro-oculography
for eye-movement monitoring some years ago, and it was quite difficult.
Heart rate monitoring was very easy.

Leon
--
Leon Heller
Amateur radio callsign: G1HSM
Email: leonspamKILLspamlfheller.demon.co.uk http://www.lfheller.demon.co.uk
Tel: +44 (0) 118 947 1424 (home) +44 (0) 1344 385556 (work)

1997\03\22@145840 by Philippe TECHER

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richardd wrote:
>
> hi all
>
> does anyone out there know where i can get information on biofeedback
> such as monitoring points, waveforms, voltages, temperature and the pic
> processor.
>  i'de like to build a brain wave analyzer with a pic processor that has
> an infra red link to my computer can anyone help me in anyway with this
> project
> thank you
> richard

If you play with such thing, be very carrefull about isolation.
You need to have all the system powered by some battery to avoid:
       - possible electrocution problem,
       - interferences with other signal as the input signal is very
very low: micro-volt, use instrumentation amplifier (Maxim/Analog Device/
Burr Brown) with ultra low noise.

Then, to transmitt the signal there is many solutions such:
       - opto-coupler
       - specialized circuit (see Analog device/Burr Brown Data book)
Regards,
       Philippe.

-----------------------------------------------------------
Virtual Micro Design,
UMPS: The Universal Simulator.

E-Mail: .....p.techerKILLspamspam.....idls.izarbel.tm.fr
URL:    http://idls.izarbel.tm.fr/entp/techer/P01.HTM
or      http://sistudio.com/umps (USA)

1997\03\24@004435 by Mike Smith

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>>does anyone out there know where i can get information on biofeedback
>>such as monitoring points, waveforms, voltages, temperature and the pic
>>processor.
>> i'de like to build a brain wave analyzer with a pic processor that has
>>an infra red link to my computer can anyone help me in anyway with this
>>project
>
>The IR link is a good idea, as it will ensure that you don't get the
>mains connected to your body. Look for stuff on bioengineering and
>medical electronics. "Brain waves" are rather tricky; you need silver-
>silver chloride electrodes, low-noise connections, high gain
>amplification and lots of filtering. I'd start with something relatively
>straightforward like heart rate. I did some work on electro-oculography
>for eye-movement monitoring some years ago, and it was quite difficult.
>Heart rate monitoring was very easy.

Further to that comment about the silver electrodes, etc how about looking at EEG suppliers for some of the sensor gear?  It must be somewhat of a 'consumable' as far as the specialists go.  Further, they seem to use a saline solution/gel to ensure good contact, and work best when hair is 'clean' (no sprays, gels, grease etc).  This is assuming that biofeedback works something like EEG's.

MikeS

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