[EEG] low budget EEG project

Tracy Jacobs kinetical at comcast.net
Tue Jul 13 19:57:24 PDT 2010


I forgot to add that I could also come in on a Wednesday night or any  
weeknight really.

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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