bci2000.org BBS

Hi,

I'm trying to run the CursorTask. I followed the instructions at: http://www.bci2000.org/wiki/index.php/U ... al_Session

But after setting the configurations and clicking "Start" no arrows appear to perform the initial session.
I don't know, what am I doing wrong...

I set all parameters and configurations. When I click "Start" I see a ball going to the upper side and a square which moves after a few seconds.

Please tell me what to do...

Thank You!

Hi,

it appears you are starting up BCI2000 from the wrong batch file. Please follow the steps in the tutorial, and use batch/StimulusPresentation_<YourAmplifier>.bat to start up BCI2000. In case no such batch file exists, please follow the advice in the tutorial, and first perform the steps suggested on this page:
http://www.bci2000.org/wiki/index.php/C ... atch_files

Regards,
Juergen

Okay, that worked fine. Thanks.

Now I came to the point where I have to enter laplacian filter coefficients into the spatial filter matrix.
I have no idea what I have to enter there.... Is there a formula?
I'm using the Emotiv EPOC BCI. So there are the following electrodes: AF3 F7 F3 FC5 T7 P7 O1 O2 P8 T8 FC6 F4 F8 AF4

There matrix looks like in the picture.

What do I have to enter into the matrix????

Thank You!

A Laplacian montage is constructed by subtracting the mean of the four surrounding electrodes from each target electrode. There is a "Large Laplacian" and a "Small Laplacian" montage, depending on whether immediately neighboring electrodes are used, or electrodes that are further away in the 10-20 system (http://www.bci2000.org/wiki/index.php/U ... nal_System).

So in each output row, you have a weight of +1 where input and output electrode match, and -0.25 where the input electrode is one of the four surrounding electrodes.

For a Large Laplacian montage, surrounding electrodes of Cz would be Fz, C3, C4, Pz. Similarly, for C3, surrounding electrodes would be Cz, P7, F3, P3.

Unfortunately, the Emotiv EPOC does not provide the electrode locations required for Laplacian filtering of C3, C4, and Cz.

Regards,
Juergen