Re: EEG-SMT

Hi Alex,

Good to hear that! My signal is also better when using only one channel.
With two channels one channel is always noisier but it's not linked to a
specific channel. Both channels work fine in a single channel montage.
Maybe you should do the calibration test I've mentioned earlier to see if
your channel one is calibrated correctly.

regards,

Niels

On Fri, May 31, 2013 at 9:14 AM, Alexandre Dubreucq <
[email protected]> wrote:

> 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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