Weird ERP results
Posted: Tue Sep 12, 2017 3:37 pm
Hello,
We bought a new BioSemi system where the CMS/DRL electrodes are part of the 32 electrode set (we have 64 channels thus 2 sets). I used it for the for time now but with our old AD-box. In the previous BioSemi system we had an external electrodes for the CMS/DRL which was plugged into the AD-box.
Because the electrode set were worn out I used the new set but didn't change to the new AD-box.
The ERP results (of all the 19 subjects) look very strange, very noisy base-line and no familiar ERP components (I ran a visual experiment) no N2 or P3 just a general negative amplitude through out the window. Can this be caused by a the old AD-box which had a CMS/DRL plug in but nothing connected to it?
I was told by the eeglab support that the SNR is very bad. I will appreciate any suggestion with how to solve this because I ran several experiments with BioSemi and I have never encountered any problem with the recorded data.
Thank you!
Rachel
We bought a new BioSemi system where the CMS/DRL electrodes are part of the 32 electrode set (we have 64 channels thus 2 sets). I used it for the for time now but with our old AD-box. In the previous BioSemi system we had an external electrodes for the CMS/DRL which was plugged into the AD-box.
Because the electrode set were worn out I used the new set but didn't change to the new AD-box.
The ERP results (of all the 19 subjects) look very strange, very noisy base-line and no familiar ERP components (I ran a visual experiment) no N2 or P3 just a general negative amplitude through out the window. Can this be caused by a the old AD-box which had a CMS/DRL plug in but nothing connected to it?
I was told by the eeglab support that the SNR is very bad. I will appreciate any suggestion with how to solve this because I ran several experiments with BioSemi and I have never encountered any problem with the recorded data.
Thank you!
Rachel