Re: EEG-SMT

Hi Niels,

After a couple of hours, I finally managed to get results looking like nice
brain waves recodings. I just had to use only channel 2 and let go some of
the active electrodes. My conclusion : there might be a problem with
channel 1 of my device and/or with some electrodes i bought. I used the DRL
in my hand just like you said and it worked just fine. Using a filter that
cuts out the freq 0 (continuous component of the signal) seems a good idea
though.

Thanks again.

Alex




2013/5/30 Niels Samuels <[email protected]>

> 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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