## Search found 10 matches

02 Aug 2010, 08:21
Forum: Known Issues
Replies: 3
Views: 2462
Thank you for your response, I have checked the bit rate (bits/trial) equation B=logN + PlogP + (1-P)log[(1-P)/N-1)]. so, below our result case Run #2 started Run 2 finished: 20 trials, 18 hits, 2 invalid. 100% correct, 17.8394 bits transferred P = 1 , B = 1 And 17.8394 means 17.8394 bits/min(trials...
30 Jul 2010, 09:38
Forum: Known Issues
Replies: 3
Views: 2462

Hello all~ I have a question about 1-D cursor task speed. below is our cursor task result. I don't know how to calculate the bits transferred. Total time is 118 sec for this run Run #2 started Run 2 finished: 20 trials, 18 hits, 2 invalid. 100% correct, 17.8394 bits transferred . ===================...
22 Jul 2010, 02:50
Forum: BCI Systems - Signal Processing
Topic: Offline analysis.
Replies: 12
Views: 5774
Thank you very much Adam for your response. Here are our parameters. Specially, SourceChList is not normal. We use 12 channels (first ch is 17, last ch is 39) even ch is just RMS value. Source:TDT:TDTBCI intlist SourceChList= 12 17 19 21 23 25 27 29 31 33 35 37 39 0 1 64 // the list of eeg channels ...
21 Jul 2010, 03:46
Forum: BCI Systems - Signal Processing
Topic: Offline analysis.
Replies: 12
Views: 5774

### Offline analysis.

Hello all~ I have taken cursor task experiment using BCI2000. We have two subjects. And we used 12 passive electrodes (Fz,F3,F4,Cz,C3,C4,T7,T8,P3,P4,Pz,Oz) First, we take the stimulus presentation for acquiring features We have 8runs(4 real movements and 4 imaginery). In each run we have 40 trials (...
16 Jul 2010, 10:42
Forum: BCI Systems - Signal Processing
Replies: 6
Views: 3415
Thank you very much Adam. your response is very helpful to me. :D In my case, If feedback duration is 1s, window length is 0.5s, sampling rate is 256, block size is 32. So we have 8 blocks. Then every 0.125s we calculate the spectral amplitudes. So we have 4+1=5 mean of spectral amplitudes. And each...
16 Jul 2010, 07:36
Forum: Data Analysis
Topic: MEX files
Replies: 3
Views: 3644
Thank you for your response As your mention, i tried like below parms=[20, 0, 30, 3, 15]; [spectrum, frequency]=mem(double(signal), parms); but i have another error message ??? Error using ==> mem Bin width must be between 0 and half the sampling rate. Error in ==> test at 26 [spectrum, frequency]=m...
16 Jul 2010, 01:15
Forum: BCI Systems - Signal Processing
Replies: 6
Views: 3415
Thank you very much Adam for your quick response~ I under stand about ModelOrder and EvaluationPerBin. I have another question about WindowLength. If i set the WindowLength to 0.5s then calaulate the mean of spectral amplitudes every 0.5s of feedback duration? this is right? for example, I think if ...
14 Jul 2010, 21:46
Forum: BCI Systems - Signal Processing
Replies: 6
Views: 3415
Thank you very much wilson~ Your reply is very helpful to me. I have another question. In AR filter there are many parameters. if ModelOrder =16 FirstBinCenter = 0 LastBinCenter = 30 BinWidth = 3 EvaluationsPerBin =15 EvaluationsPerBin is depends on ModelOrder? I think 16AR coefficients in each bin....
14 Jul 2010, 04:03
Forum: Data Analysis
Topic: MEX files
Replies: 3
Views: 3644

### MEX files

:D Hello all~ I have a question about MEX files document in BCI2000 wiki in the function of mem. [spectrum, frequencies] = mem(signal, parms); I don't know how is the form of input parms. I have tried many forms of parms but error massage is occurred. for example, parms = [parameters.ModelOrder.Nume...
13 Jul 2010, 22:20
Forum: BCI Systems - Signal Processing