[EEG] low budget EEG project

Dan Brown danbrown at gmail.com
Tue Jul 13 17:18:27 PDT 2010


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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>>>>
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