[EEG] low budget EEG project

Tracy Jacobs kinetical at comcast.net
Tue Jul 13 16:24:27 PDT 2010


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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