bci2000.org BBS

Hi, I'm a college student currently working on the BCI2000 2D cursor task with Field trip buffer.

To moves cursors all directions (up, down, left, and right), I followed the description from the wiki that
event_up = event;
event_up.value = 1;
event_down = event;
event_down.value = -1;
event_null = event;
event_null.value = 0;
(see http://www.bci2000.org/wiki/index.php/P ... rip_buffer)

Currently, my cursor moves right and left (x-axis) with matlab coding of
event_right.value=1,
event_left.value =-1.

While I'm trying to move my cursor on y-axis(since I'm aiming for 2D control), I couldn't figure out how I should write the script for up & down movements.
Does anyone know how to do it?

Thanks.

Hi, should work if you set deltaX and deltaY to the desired change in position.

HTH,
Juergen

Hi, Juergen

I tried the method you posted, but the BCI2000 operator had an error that:

%----------------------------------------------------

8/21/2012 3:03:23 PM - FieldTripBufferFilter::Process: Number of entries in Signal event must match the total number of entries in the FTInitialOutput matrix.

%----------------------------------------------------

I googled it, but had no clue what it means.
Can you give me an advice for it?

Thanks
Kirnsk2011

Ah, right. You need to resize the FTInitialOutput matrix parameter to have two rows, and one column, and each entry set to 0.

Best,
Juergen