[EEG] low budget EEG project

Kelly hurtstotouchfire at gmail.com
Tue Jul 13 18:17:37 PDT 2010

We could plan for Wed evening instead if folks want. I could be there then.

Dan, I think you're the only one with a concrete goal, and that's a
useful focal point for a group.


On Tue, Jul 13, 2010 at 17:18, Dan Brown <danbrown at gmail.com> wrote:
> Thanks for the advice and suggestions! I hope to get something built
> up to a state where it can be compared with existing EEG products,
> like OpenEEG and the Zeo sleep monitor. I'll report back to this group
> if/when I'm ready to test.
> I won't be able to make it on Sunday, but I will be there working next
> Tues and Wednesday in the afternoon and evening. I will attempt to get
> data moving through a mindflex+bluetooth into a linux laptop. Come by
> and say hello! And I will try to make it to one of the upcoming Sunday
> sessions eventually.
> For those that are interested in building one, too, here are the parts
> I will be using:
> mindflex http://www.walmart.com/ip/Mindflex/11004056
> bluetooth radio http://rovingnetworks.com/rn-41-sm.php
> usb dongle for bluetooth http://www.dealextreme.com/details.dx/sku.11866
> Dan
> On Tue, Jul 13, 2010 at 4:26 PM, Kelly <hurtstotouchfire at gmail.com> wrote:
>> Andreas is around. Looks like Sunday afternoon works for us? I'll try
>> to drag Andreas. He lives across the street from me now.
>> -Kelly
>> On Tue, Jul 13, 2010 at 16:24, Tracy Jacobs <kinetical at comcast.net> wrote:
>>> Sunday afternoon works for me, I agree it would be good to set a time,
>>> because it has been varying a lot.  Is Andreas still here?
>>> Tracy
>>> On Jul 13, 2010, at 3:16 PM, Vicente Malave wrote:
>>>> Hi. I am interested in meeting up on Sunday too. I also do EEG for a
>>>> living, and I'm less interested in the hardware than in what happens
>>>> after you record some data.
>>>> I'm also completely unconvinced (having been a user of both) that
>>>> active electrodes solve a useful problem. Far more important is taking
>>>> the time to make sure you attach the electrodes properly, obtain a
>>>> good electrical connection to the scalp to begin with, and control or
>>>> shield the ambient electromagnetic fields if you can.
>>>> Vicente Malave
>>>> On Tue, Jul 13, 2010 at 2:09 PM, Robert Picone <rpicone at gmail.com>
>>>> wrote:
>>>>> 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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