Search found 13 matches

by tcetin
06 Apr 2011, 05:23
Forum: BCI Systems - Signal Processing
Topic: P300 Speller - Basic Questions...
Replies: 4
Views: 4257

P300 Speller - Basic Questions...

Hi, I have some basic problems understanding the general functionality of the way the P300-Speller works in its signal processing... We have established the p300-Speller-System here and it works very well using the p300-classifier classefier that comes with ist (even though the classifier-program it...
by tcetin
01 Mar 2011, 11:41
Forum: Known Issues
Topic: which hardware to use with BCI2000
Replies: 5
Views: 3580

Re: hardware

BrainVision amps should work fine with BCI2000 as well. Gerv Yes, we use the BrainProducts BrainVision and it works very well, at least after we overcame some initial problems. The only issue we have here at the moment is that the capability of the BCI2000s P300Classifier for calibration of the P30...
by tcetin
01 Mar 2011, 10:17
Forum: Configuration
Topic: P300 Speller - Worng Letter, correct line
Replies: 18
Views: 7353

Re: battery

Hi, The battery status is not written to the file. In general, no BrainProducts-specific information should influence the operation of the P300Classifier. The only thing I can think of is that the low battery status changes the way the data are acquired (perhaps one or more channels contain only ze...
by tcetin
01 Nov 2010, 05:28
Forum: Configuration
Topic: P300 Speller - Worng Letter, correct line
Replies: 18
Views: 7353

Thanks, I can do that. But the files are not absolutly necessary for us, it is just more a question to understand what really happens, is it possible that the lower battery charge causes this kind of bug? It must be, as now the amplifier was charged over the weekend and it works fine again. Is infor...
by tcetin
29 Oct 2010, 09:25
Forum: Configuration
Topic: P300 Speller - Worng Letter, correct line
Replies: 18
Views: 7353

Hi, so we are using the Classifier-Program now and get very good results now, but a question came up... Sometimes the *.dat-File recorded in the calibration session cannot be processed in the p300-classifier program, the computer crashes when we try to generate the feature weights of certain files. ...
by tcetin
14 Sep 2010, 07:09
Forum: Configuration
Topic: P300 Speller - Worng Letter, correct line
Replies: 18
Views: 7353

There is a lot of information on the wiki, at http://www.bci2000.org/wiki/index.php/User_Reference:P300Classifier . Basically, it uses a step-wise linear discriminate analysis to try to find the time points that are significantly associated with the correct stimulus, and uses those for the classifi...
by tcetin
13 Sep 2010, 07:00
Forum: Configuration
Topic: P300 Speller - Worng Letter, correct line
Replies: 18
Views: 7353

Hi, many thanks for your help! I just tried it and using the P300 Classefier seems to do the trick, with just 2 files for calibration the generated *.prm-file led to nearly 100% correct in the first spelling session...great, but now its up to some theory for me, I have no Idea what the classefier (a...
by tcetin
10 Sep 2010, 07:38
Forum: Configuration
Topic: P300 Speller - Worng Letter, correct line
Replies: 18
Views: 7353

Re: P300GUI

Instead of the P300GUI, you can also use the P300Classifier that comes with BCI2000 V3.0. The P300Classifier does not need Matlab. Gerv Very nice, that seems to be working, I just gave it a try - we could not use the GUI as the Matlab-Version avaliable to us does not provide the statistics toolbox....
by tcetin
09 Sep 2010, 06:25
Forum: Configuration
Topic: P300 Speller - Worng Letter, correct line
Replies: 18
Views: 7353

Hi, I am sure that the speller uses gernally row and column, I know that it seems to be working for other people, yet I we thought there might be a bug in it only we managed to get, maybe something specific to our setup. I guess using the GUI should be my first priority, but I also havn't managed to...
by tcetin
08 Sep 2010, 07:10
Forum: Configuration
Topic: P300 Speller - Worng Letter, correct line
Replies: 18
Views: 7353

Thanks for the answer, I haven't used the P300 GUI so far and will give it a try...otherwise we were also thinking of a basic technical reason for this problem, but we have already switched to a dark room, tried different illuminations while performing the session, varied the distance between subjec...
by tcetin
30 Aug 2010, 06:40
Forum: Configuration
Topic: P300 Speller - Worng Letter, correct line
Replies: 18
Views: 7353

P300 Speller - Worng Letter, correct line

Hi, We are trying since a few weeks to establish BCI2000's P300-Speller in our lab, but its not really doing what it should - basically we get in about 75% of the experiments a letter from the correct line, but not the expected letter. More rarely we get a letter from the correct column, but the act...
by tcetin
20 Aug 2010, 07:29
Forum: BCI Systems - Brain Signals
Topic: "replay" recorded data
Replies: 4
Views: 4568

Many thanks for the quick reply
by tcetin
20 Aug 2010, 05:38
Forum: BCI Systems - Brain Signals
Topic: "replay" recorded data
Replies: 4
Views: 4568

"replay" recorded data

Dear BCI2000-People, I would like tom "replay" some recorded data, i.e. record a P300-speller-Session with a subject, than possibily change some settings and use it on the same EEG-data. Is there a way to input the same EEG-File, that was alredy obtained in a previous session, in BCI2000 again? Rega...