Re: EEG While Meditating

Hi Stefan,

I definitely had this problem with a Neurobit amp and a DAVID Pal ave
device. Tried to do some SMR entrainment session, eeg recording the other
day. The Neurobit lite rewarding signal completely maxed out at the flick
of the switch of the AVE device. It continued to do so until I turned it
off. Flick it back on, SMR signal maxed out again....and so on. So beware.

Regards,


On Thu, Jan 2, 2014 at 9:37 PM, Stefan Jung <[email protected]> wrote:

> Hi Michael
>
> What type of LightStone have you got, is it the blue one?  I
> reverse-engineered the blue one many years ago and know for a fact that it
> uses DC to do the GSR, or the more modern term is SCL, measurement.  But
> there is a IOM interface that is more expensive and uses galvanic
> isolation.  It is possible that this IOM unit uses AC excitation for it's
> GSR/SCL measurement.
>
> If you use DC, it shouldn't interfere with your EEG recordings, but if it
> is AC you an possibly expect interference.
>
> AC excitation for GSR is obviously the best method to use but because it
> is technically more difficult few people bother.
>
> Talking about interference, one should also be careful of using AVE
> equipment with EEG.  The sound is no problem because it runs typically at a
> few 100Hz which is outside the EEG range.  But what **CAN** be problematic
> is running the wires of the LED goggles close to EEG wires.  The LEDS are
> normally pulsed at highish currents of perhaps 100mA or even more.  They
> are also pulsed in exactly these low brain-wave frequencies.  The the
> induced voltages lie exactly in the middle of the EEG spectrum.
>
> I don't say you can't use AVE with EEG amps, all I am saying there is the
> potential for interference and one should check for this.
>
> Regards
> Stefan
>
>
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