[EEG] low budget EEG project

Tracy Jacobs kinetical at comcast.net
Tue Jul 13 19:56:00 PDT 2010


I have a concrete goal of getting servos to move from Brainbay and EEG  
data.  Also to get the extra board hooked up in the EEG and to make  
electrode cables that work.

Tracy
On Jul 13, 2010, at 6:17 PM, Kelly wrote:

> 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.
>
> -Kelly
>
> 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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>>>>>>
>>>>>>
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