bci2000.org BBS

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.
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

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

Thanks for your reply.

I adjusted the reference input.
But I still cannot see any signal as below figure 1. I set up the parameter as below figure 2. 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. Please let me know what is missing...



Best regards,

Hohyun Cho

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

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