Re: question about 10-20 map

Hello Wikitronic,

The question "What information can I gather from a simple eeg device" is 
a complicated one! Answers range from "not much", to "read the mind of 
your pet dog" (not kidding). There are firm opinions everywhere in 
between, with varying degrees of reliability.

Probably the first question is: what information are you interested in? 
Asking whether you can gather information X with system Y will provide a 
good context for knowledgeable people to give their opinions.

Regarding electrode placement, it depends on the answer to the first 
question. Electrode placement might be different if you're interested in 
neurofeedback vs. BCI vs. sleep tracking, for example. Before you build 
your electrodes into a headband, you might want to try experimenting 
with different locations.

I'm not sure what stage of your development you're at, but if you are 
doing preliminary testing of your electrodes or other parts of the setup 
you may want to start with measuring EKG, if you haven't done so 
already. It's a much stronger signal than EEG, and could make 
troubleshooting easier.

Also, you'd be welcome to start a thread on NeuroBB (http://neurobb.com) 
about your project. I think NeuroBB members would be interested in 
following your progress, and could help out with EEG-related questions.

Cheers,
Adam


On 06/08/2015 9:38 AM, wikitronic wrote:
> Besides that I am experimenting with using analog switches for the 
> electrodes. I'm not sure what the result will be, that's why I say it 
> is just an experiment. I may decide it just won't work. If I can make 
> It work I could be able to select any 2 of many electrodes for inputs. 
> I'm studying the features of the switches and trying to choose the 
> right ones to order. If anyone knows a good part number to test that 
> would be helpful. So far I have tested 2 and I have ordered more. 
> Right now I am using a multiplexer and grounding the unused electrodes 
> to prevent crosstalk. At least I believe that is the issue I'm having. 
> This will not work with my active electrodes because I am grounding 
> the output of the electrodes. I am going to try using switches instead 
> of a multiplexer. From what I have found there are switches with high 
> off isolation. The "T" switch design has higher off isolation. Then 
> there are switches that have crosstalk between channels. If I can't 
> eliminate that I could go with individual packages. I think the active 
> electrodes will improve the switch capability. I don't keep my designs 
> secret. I would rather be able to discuss them, unless someone wants 
> to talk business.
>
> Thanks
>
> On Thu, Aug 6, 2015 at 10:01 AM, wikitronic <[email protected] 
> <mailto:[email protected]>> wrote:
>
>     I don't have much of a vocabulary in eeg terms. If ,for example, I
>     want to measure the left temporal lobe,the 10-20 map shows t3 and
>     t5 for that region. A more detailed map shows four locations
>     marked T. Some of the regions are on opposite sides of the head
>     such as o1 and o2. Would T3 and T4 be a valid choice or only t3
>     and t5 ?
>
>
>     What information can I gather from a simple eeg device and where
>     do I place the electrodes?
>
>     Basically, I'm making a headband/cap for the head and I need to
>     know where to put the electrodes.
>
>     Thanks,
>
>
>
>
> ------------------------------------------------------------------------------
>
>
> _______________________________________________
> Openeeg-list mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/openeeg-list
> Go to the above address to change your
> subscription options, e.g unsubscribe.

------------------------------------------------------------------------------