Search found 12 matches

by Brendan
21 Jul 2004, 15:15
Forum: Software Development
Topic: color coding BCI2000
Replies: 1
Views: 3173

color coding BCI2000

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...
by Brendan
23 Jun 2004, 17:44
Forum: BCI Article Commentaries
Topic: 2D mu BCIs
Replies: 1
Views: 5935

2D mu BCIs

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....
by Brendan
15 Jun 2004, 20:17
Forum: BCI Systems - Signal Processing
Topic: SSSignalProcessing
Replies: 7
Views: 6675

mod to ARSignalProcessing

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...
by Brendan
07 Jun 2004, 21:38
Forum: BCI Systems - Signal Processing
Topic: SSSignalProcessing
Replies: 7
Views: 6675

SSSignalProcessing

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 ...
by Brendan
25 May 2004, 17:42
Forum: BCI Systems - User Applications
Topic: the ultimate P300 trainer
Replies: 0
Views: 3521

the ultimate P300 trainer

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,...
by Brendan
20 May 2004, 08:40
Forum: BCI Systems - Signal Processing
Topic: using slow wave activity from a P3 speller in BCI2000
Replies: 1
Views: 3071

using slow wave activity from a P3 speller in BCI2000

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...
by Brendan
04 May 2004, 11:32
Forum: Known Issues
Topic: first use of RJB
Replies: 0
Views: 3456

first use of RJB

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 ...
by Brendan
04 May 2004, 11:24
Forum: Software Development
Topic: nonlinear transform for P300 BCI
Replies: 0
Views: 3628

nonlinear transform for P300 BCI

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, ...
by Brendan
02 Apr 2004, 15:28
Forum: BCI Systems - Brain Signals
Topic: P3-Speller Target-NonTarget Signal values
Replies: 8
Views: 12656

offline testing of single channel SWDA

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 update the MUD...
by Brendan
28 Feb 2004, 11:31
Forum: Known Issues
Topic: Predicted Character
Replies: 1
Views: 3133

Predicted character: SUSPECTED BUG

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...
by Brendan
28 Feb 2004, 11:14
Forum: Known Issues
Topic: Matrix Flashes
Replies: 4
Views: 4711

Finding when and which flash occurred with BCI2000/Matlab

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...
by Brendan
26 Jan 2004, 16:04
Forum: Software Development
Topic: How to move the cursor
Replies: 4
Views: 4986

Getting mu power spectra from BCI2000

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...