[EEG] low budget EEG project

Robert Picone rpicone at gmail.com
Tue Jul 13 14:09:37 PDT 2010


On Tue, Jul 13, 2010 at 1:28 PM, Maria Mouk <mariamouk at gmail.com> wrote:

> itd be my first visit to noisebridge
> so i can be there on sun
> just give me a time =D
>
> mm
>
I'm probably going to be hopping in the first-visit boat with you in that
case, as I'm rather interested in the topic and have been meaning to show up
at NB for something one of these days anyway.



> >>> > On Tue, Jul 13, 2010 at 11:20 AM, Kelly <hurtstotouchfire at gmail.com>
> wrote:
> >>> >>
> >>> >> Given the charts in the first link, it should be possible. I'm
> >>> >> skeptical of their gamma, but the <35Hz data is totally reasonable.
> I
> >>> >> think that the big win is that it's a fully packaged device already,
> >>> >> with bluetooth/wireless built in. A lot of the hassle with eeg comes
> >>> >> in just tweaking little stuff to get good contact and shield from
> >>> >> noise. Do you know if the Neurosky electrodes are active? I have
> >>> >> trouble imagining they could get that data from passive electrodes.
> >>> >> And if they're active, that's a pretty big win, because active
> >>> >> electrodes are a little bit of a hassle to build. It would probably
> be
> >>> >> worth trying to hack directly into the connection and get the raw
> data
> >>> >> if they're active, because then we could harvest readymade active
> >>> >> electrodes... That sounds nice.
>

While for the Mindflex technically has Bluetooth-band wireless is built in,
nobody has yet been able to get much use out of it because by default a
significant portion of the useful data is filtered out before it is reached.
 The $200 standalone model does have full serial over Bluetooth built in if
that's what you mean.

As for the electrodes, from what I've seen it would seem that they aren't
active (though what I've seen isn't hugely informative on the subject), but
the amplification/analysis of the system is entirety done inches away from
them anyway, so you might get some of the advantages of an active electrode
system.  If you were talking about the same data I'm thinking of, it seems
that they may have also been using higher quality electrodes, distinct from
the ones in their actual consumer products, as a proof-of-concept for their
dry electrode system.
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