bci2000.org BBS

Hello, The SourceSignal window in BCI2000 is one of the most heavily used windows. Yet, it is often difficult to know which colored line corresponds to which electrode. At present, on the far left of the SourceSignal window, you see the number for each electrode in the same color (cyan). I suggest c...

Hello, I am writing to ask the BCI community about 2 dimensional mu BCIs. In a discussion with Gerv Schalk a while back, we agreed that the only two approaches to a 2 dimensional mu BCI in the literature were the Wolpaw lab's work (eg, Wolpaw et al. 1994) and Kostav and Polak 2000, which is similar....

Hi, I think that ARSignalPRocessing would need to be modified, as it is currently not configured to take an external trigger. The module must not only look at spectra, but also first create epochs based on the onset of each LED flash. It has to do this in realtime, which is not currently possible. T...

Hello, I am interested in using BCI2000 with the steady state visual evoked potential (or response), aka the SSVEP or SSVER. I believe this will require the development of a new signal processing module, SSSignalProcessing, hereafter abbreviated SSSP. Like P3 Signal Processing, SSSP must be able to ...

P300 BCIs stand out in that they require no training. This is true of very few other BCI approaches, and is often touted as a major advantage of P300 based BCIs. Unfortunately, this also means there is much less work on the long term effects of BCI use than other approaches that do require training,...

Hello, I have an idea that may improve P3 BCIs. I recently spent a full weekend demonstrating a P3 BCI at a public expo called NextFest. I was the experimenter, BCI2000 operator, and the subject. While doing 50+ consecutive runs with a 6 x 6 Donchin matrix for 7 hours, I had a lot of time to muse ab...

Hello, The first time a subject is run using the RJB protocol, during the first trial of the first run only, the cursor moves to the top of the screen and does not respond to use input. BCI2000 outputs increasilgy large negative numbers during this run. This is not so much a bug as a side effect of ...

Hello, I am writing to ask if anyone has tried adapting BCI2000 so that it can utilize a P300 BCI with a nonlinear pattern recognition approach. This would seem to be a nontrivial feat, as it would involve modifying both operator and the P3 signal processing module. If anyone is interested in this, ...

Hello, Janki and I have already tested a simpler version of this "adaptive algorithm" offline. We would run a subject using the P3 speller, and process the data in BCI time frequency. I would look at Fz, Cz, and Pz, and determine which had the largest difference. I would then manually upda...

Michael, I think you have hit on a bug that we found here as well. The reason they don't match up is that there are really two different parameters in BCI2000 for controlling the number of flashes that occur and the number of flashes used for the pattern recognition system. The first is controlled b...

Hello, First, I would recommend you dowloand the EEGLab toolkit from sccn.ucsd.edu. This is a free Matlab package designed for viewing and manipulating EEG data. I have a few little scripts I wrote for this that could help. This toolkit makes it much easier to visualize when and where different thin...

Hello, In response to the recent posts from Gerv and Umang on this subject, I believe the following settings will make the output of the signal processing application equal to the mu power of 12 Hz over the C3 electrode site: 1) Under the MEMFilters tab, use the following settings: MEMBandWidth of 3...