Re: EEG-SMT

Hi,

Here's an example (screenshot attached) of a signal I get with Electric
Guru, using one channel on the forehead and holding the DRL. I use a
battery powered laptop. That is the only way for me to get a usable clean
enough signal.

On Wed, May 29, 2013 at 11:44 AM, Alexandre Dubreucq <
[email protected]> wrote:

> Hi,
>
> I've tried using medical EEG-designed gel (conductive electrolyte gel) on
> the electrodes, but apart from getting a nice haircut I saw exactly no
> change in the signal.
>
> I think the problem is that there is a lot of noise in the signal, because
> what I get is far from a normal EEG graph (or maybe it is my brain...).
>
> Niels, can you tell me which software gave you the best results? Could you
> by any chance share with me the kind of signal you get (for example with a
> screenshot or a data file) with your EEG-SMT device?
>
> Regards,
>
> Alex
> Le 28 mai 2013 16:24, "Charles Z Henry" <[email protected]> a écrit :
>
> Hi all
>>
>> I was debugging my EEG-SMT this weekend also.  The impedance seems to be
>> the issue.  By shorting out the DRL and the electrodes I get a perfectly
>> flat signal.
>>
>> I also tried putting the EEG on a cantaloupe.  The impedance was low
>> enough that the signals stabilized and started making noisy little orbits
>> around 0, but I really had to hold the electrodes tightly.
>>
>> One thing that I didn't like:  once you lose the signal and re-establish
>> the connection, it takes about 10 seconds for the signal to stabilize
>> again.  I am hoping to use the EEG-SMT for live performances, and it may be
>> disrupting it takes too long to re-estabilsh connection.  However, I don't
>> know what to do about it yet.  Probably the best thing is not to lose
>> connection in the first place.
>>
>> I'm still thinking about how to modify the electrodes.  I think it would
>> be useful to add sponges+electrolyte solution to keep the impedance low.
>> Anybody else thinking about modifying the electrodes now?
>>
>> Chuck
>>
>> On Mon, May 27, 2013 at 6:10 PM, Niels Samuels <[email protected]>wrote:
>>
>>> Hi Alexandre,
>>>
>>> I've managed to get a good signal with the device but only with all four
>>> (if using both channels) of the active electrodes on the forehead using a
>>> "fairly tight" headband and holding the DRL in my hand or stuck under the
>>> headband as well. Also I can only work with the device using a laptop
>>> running on the battery (no mains) and using a high quality usb cable. I'm
>>> then able to obtain a signal with fairly low mains interference.
>>>
>>> Hope this helps.
>>>
>>> Kind Regards,
>>>
>>> Niels
>>>
>>> On Mon, May 27, 2013 at 9:27 PM, Alexandre Dubreucq <
>>> [email protected]> wrote:
>>>
>>>> Hello everyone,
>>>>
>>>> I got myself a OLIMEX EEG-SMT device, and i can't get it to work
>>>> properly : the signal is very messy, and if i take off one electrode,
>>>> nothing changes on the signal in the software (using brain bay or
>>>> elecguru for example).
>>>>
>>>> Has someone already managed to have some results using OLIMEX EEG-SMT
>>>> ? If yes, how did u fix the electrodes on your head ?
>>>>
>>>> Thanks
>>>>
>>>>
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