Biosemi2 EOG,ECG, and EMG acquisition

This forum deals with BCI2000 configuration issues.
Locked
hcho
Posts: 5
Joined: 20 Mar 2011, 21:27

Biosemi2 EOG,ECG, and EMG acquisition

Post by hcho » 02 Aug 2011, 02:23

Hi,

I'd like to acquire EOG,ECG, and EMG signals during EEG acquisition using Biosemi2 64 electrodes.
I connected two EMG electrodes (flat-type active electrodes) to the external channel 1 and 2.
But I cannot see any signal at external channels as below a figure.
emgtest.jpg
I excuted a batch file like as below :

cd ..\prog
start operator.exe
start Biosemi2.exe 127.0.0.1
start DummySignalProcessing.exe 127.0.0.1
start StimulusPresentation.exe 127.0.0.1
cd ..

Please help me to acquire EMG signal.

Best regards,


Hohyun Cho

mellinger
Posts: 1172
Joined: 12 Feb 2003, 11:06

Re: Biosemi2 EOG,ECG, and EMG acquisition

Post by mellinger » 02 Aug 2011, 09:31

Hi,

you should make sure to connect all unused amplifier inputs to the reference input. Otherwise, you will get so much noise from the open inputs that you won't see any signal on the channels in use.

Regards,
Juergen

hcho
Posts: 5
Joined: 20 Mar 2011, 21:27

Re: Biosemi2 EOG,ECG, and EMG acquisition

Post by hcho » 03 Aug 2011, 08:22

Thanks for your reply.

I adjusted the reference input.
But I still cannot see any signal as below figure 1.
signal.png
I set up the parameter as below figure 2.
parms.png
If I touch the EEG electrodes I can see the response from signal window.
But if I touch the Ex1, Ex2 electrodes( flat-type ) I cannot see any responses.

I connected the EEG, Ex1, and Ex2 channels as below.
IMG_1549.JPG
Please let me know what is missing...



Best regards,

Hohyun Cho

mellinger
Posts: 1172
Joined: 12 Feb 2003, 11:06

Re: Biosemi2 EOG,ECG, and EMG acquisition

Post by mellinger » 03 Aug 2011, 08:44

I'm not familiar with the Biosemi amplifier, but I guess you should try AIBChList rather than TriggerChList.

chazzd13
Posts: 14
Joined: 12 May 2010, 03:51

Re: Biosemi2 EOG,ECG, and EMG acquisition

Post by chazzd13 » 26 Aug 2011, 00:39

If you're still having trouble, check out my post here:
http://www.bci2000.org/phpbb/viewtopic.php?f=9&t=1050

Locked

Who is online

Users browsing this forum: No registered users and 1 guest