Search found 51 matches
- 01 Feb 2010, 18:05
- Forum: BCI Systems - User Applications
- Topic: control signal in curosr movement application
- Replies: 3
- Views: 4219
Hello: Thank you very much, Adam. I have another question. If I use two control signals for the two cursor movement, for example, up and down. How could the system know which control signal is for which cursor movement? I can't find any specification of the relation between them in the BCI2000 param...
- 01 Feb 2010, 16:48
- Forum: BCI Systems - User Applications
- Topic: cursor movement application
- Replies: 7
- Views: 6991
The CursorTask application is a 3D application. The cursor will move in the 3 dimensions based on the output channel of the linear classifier (see http://www.bci2000.org/wiki/index.php/User_Reference:LinearClassifier ), which is the third column of the linear classifier matrix. Therefore, to make a...
- 28 Jan 2010, 16:16
- Forum: BCI Systems - User Applications
- Topic: cursor movement application
- Replies: 7
- Views: 6991
Thank you very much, Adam. It really helps. I have another question of the cursor movement application. For example, if the motor imagery of right hand movement is the control signal moving the cursor up, what exactly controls the speed of cursor's moving up? Is that the amplitude of the correspondi...
- 21 Jan 2010, 16:51
- Forum: BCI Systems - User Applications
- Topic: control signal in curosr movement application
- Replies: 3
- Views: 4219
control signal in curosr movement application
Hello: I have a question about the cursor movement application in BCI2000. The tutorial said users could use the motor imagery to move the cursor up, while use relaxation to move it down. I am wondering whether they can use two different motor imageries to move the cursor up and down, respectively? ...
- 21 Jan 2010, 15:27
- Forum: BCI Systems - User Applications
- Topic: cursor movement application
- Replies: 7
- Views: 6991
cursor movement application
Hi,
Does BCI2000 have 2D cursor movement application? I can only find the 1D cursor movement? Thanks a lot.
Does BCI2000 have 2D cursor movement application? I can only find the 1D cursor movement? Thanks a lot.
- 17 Dec 2009, 12:34
- Forum: BCI Systems - User Applications
- Topic: channel selection in Mu rhythm
- Replies: 3
- Views: 4222
- 16 Dec 2009, 18:28
- Forum: BCI Systems - User Applications
- Topic: channel selection in Mu rhythm
- Replies: 3
- Views: 4222
channel selection in Mu rhythm
Hello: I am training users to use Mu rhythm with BCI2000. I found several questions: 1. I am trying to use left hand movement as a control signal in the curse movement. According to the tutorial, electrode C3 should be used. But, I found a bigger r square value in electrode F3 . So, should I use F3 ...
- 20 Nov 2009, 11:46
- Forum: BCI Systems - User Applications
- Topic: Mu rhythm training
- Replies: 1
- Views: 3094
Mu rhythm training
Hello:
I am using Mu rhythm and follow exactly the tutorial, but found it not easy to train the users to imagine the movement. I want to know how much training is needed generally? Thanks a lot.
I am using Mu rhythm and follow exactly the tutorial, but found it not easy to train the users to imagine the movement. I want to know how much training is needed generally? Thanks a lot.
- 03 Mar 2009, 23:44
- Forum: BCI Systems - User Applications
- Topic: about P300GUI
- Replies: 3
- Views: 3959
Dr. Schalk: Thanks for your reply. I used 10 characters in each run. So, there were totally 50 characters in the training session. Is that enough for participant with motor disabilities? I have one question for testing the training classifier weight. What is a good classifier? It seems that the accu...
- 03 Mar 2009, 00:57
- Forum: BCI Systems - User Applications
- Topic: about P300GUI
- Replies: 3
- Views: 3959
about P300GUI
Hi, I met some problems in building the classifier with P300GUI. I had 5 runs in the training session. I wanted to use four of them to build the classifier and the left to test the classifier. However, I can't build a good classifier with the training data. The accuracy is always very low in the tes...
- 15 Feb 2009, 01:30
- Forum: BCI Systems - Signal Processing
- Topic: source derivation
- Replies: 3
- Views: 4448
reference and ground
Hi, Dr. Schalk: Thank you for your reply. I have another two questions. 1. Since the measurement is unipolar, so I think the potential measured is in fact the difference between each electrode and the reference electrode. Is this the amplitude we use in the data analysis or just the amplifier input?...
- 13 Feb 2009, 01:31
- Forum: BCI Systems - Signal Processing
- Topic: source derivation
- Replies: 3
- Views: 4448
source derivation
Hi: I have several simple questions about the source derivation. 1. What is the function of the Ground and Reference electrode on the EEG cap? Are they used to get the amplitude (or potential) for the other electrodes? 2. I know they are several ways to get the amplitude, such as CAR, etc. What meth...
- 28 Jan 2009, 15:21
- Forum: BCI Systems - Signal Processing
- Topic: P300 GUI
- Replies: 14
- Views: 10484
- 27 Jan 2009, 21:22
- Forum: BCI Systems - Signal Processing
- Topic: P300 GUI
- Replies: 14
- Views: 10484
Dr. Schalk: Thank you for your answer. Do you mean that it is because of the BCI2000, rather than P300GUI? Since this is part of an old experiment, to keep the consistency, I used BCI2000 V1.4 (all the training sessions have been done with BCI200 V1.4), instead of the BCI2000 V2.0. Is there any way ...
- 27 Jan 2009, 18:35
- Forum: BCI Systems - Signal Processing
- Topic: P300 GUI
- Replies: 14
- Views: 10484
P300 GUI
Hi, I met some problems when using P300 GUI. I tried to use P300 GUI to produce r square plots, but got the following error message: >> P300_GUI Loading files... run 1... Collecting Responses... ??? Index exceeds matrix dimensions. Error in ==> GetP3Responses at 24 Responses.Responses(kk,:,:)=signal...