Search found 109 matches

by jawilson
22 Nov 2011, 15:01
Forum: Configuration
Topic: software for triggers from parallel port of 2nd computer
Replies: 2
Views: 2220

Re: software for triggers from parallel port of 2nd computer

Dave, I am not too familiar with the ANT amps, but it appears that they have digital inputs. If you know which line on the parallel port is being used, you could connect that to a digital input input, and record the stimulus that way. You might setup BCI2000 to use the StimulusPresentation module, w...
by jawilson
22 Nov 2011, 14:57
Forum: Configuration
Topic: MatlabSignalProcessing
Replies: 7
Views: 3614

Re: MatlabSignalProcessing

Francesco, In what ways does the data differ? Are the number of channels the same? If you plot the signals in MATLAB, do they look like the signals plotted in BCI2000? Also, remember that the signals may be calibrated (it looks like you are using the -calibrated flag), and that there is a SpatialFil...
by jawilson
22 Nov 2011, 14:36
Forum: BCI Systems - User Applications
Topic: cursor movement
Replies: 2
Views: 2010

Re: cursor movement

Hello,
We would recommend using the CursorTask application for any real BCI experiments. The FeedbackDemo is just a short example of how to start writing your own applications; the CursorTask has full support for changing the direction of the cursor, the target locations, etc.
Adam
by jawilson
02 Aug 2011, 14:59
Forum: BCI Systems - User Applications
Topic: Mu Cursor Task Classifier
Replies: 1
Views: 2216

Re: Mu Cursor Task Classifier

I'm a relatively new BCI user, and I'm trying to implement the Mu cursor task as described in the online tutorial. I'm a little fuzzy on some of the aspects of the classifier matrix: Input Channel: According to the tutorial we simply right C3_out, C4_out etc, but assuming we are using a slightly di...
by jawilson
21 Jun 2011, 10:27
Forum: Configuration
Topic: cursortask sequence
Replies: 8
Views: 4475

Re: cursortask sequence

The normalizer subtracts an offset, and multiplies by a gain so that the result is zero mean and unit variance. It uses a collection of buffers, based on different conditions during the task (i.e., each TargetCode might have its own buffer), and these are updated during the run. See http://bci2000.o...
by jawilson
21 Jun 2011, 09:54
Forum: Configuration
Topic: cursortask sequence
Replies: 8
Views: 4475

Re: cursortask sequence

Ran, I think you will have difficulty working with the fileplayback this way. If it is feasible, I would recommend using the SignalGenerator, and using the mouse to modulate the amplitude on different channels. For example, you can set it up so that the channels produce a noisy 10 Hz sine wave, and ...
by jawilson
20 Jun 2011, 23:17
Forum: Software Development
Topic: How to increase maximum recording points?
Replies: 3
Views: 1942

Re: How to increase maximum recording points?

This is a little old, but I wanted to add that there is a DummyApplication module available, that displays nothing as well. This allows you to record as long as necessary, without worrying about the recording stopping.
Adam
by jawilson
20 Jun 2011, 23:15
Forum: Configuration
Topic: cursortask sequence
Replies: 8
Views: 4475

Re: cursortask sequence

Ran, Could you clarify what you mean by "time sync issue," and how you "fixed the time and sequence of the stimulus." ? Basically, the FilePlayback module can either playback the states from the file, or allow the program to randomly generate the sequence each time. The FilePlayback really shouldn't...
by jawilson
20 Jun 2011, 23:12
Forum: Configuration
Topic: P3Speller -Stimulus-
Replies: 7
Views: 4494

Re: P3Speller -Stimulus-

Hello, I am not sure exactly what you mean. Do you only want the rows and columns containing H E L L O to flash, and no others? Currently, there is no way to tell BCI2000 explicitly which rows/columns to flash. I suppose you could adjust the spelling matrix so that it was a 4x1 matrix, containing H ...
by jawilson
18 May 2011, 11:21
Forum: Software Development
Topic: exceeds high range (0)
Replies: 4
Views: 1592

Re: exceeds high range (0)

Ok, try this: set all of the SourceChGain values to 1. According to the instructions on the wiki ( http://bci2000.org/wiki/index.php/Contributions:Emotiv ): SourceChGain is a list of signal gains which transform the signal output to muV. The API already provides output in muV. The SourceChGain must ...
by jawilson
18 May 2011, 10:42
Forum: Software Development
Topic: exceeds high range (0)
Replies: 4
Views: 1592

Re: exceeds high range (0)

Shambhu,
I am looking into this problem. In the meantime, could you post the text of your parameter file? You can save the parameter file in the configuration window, open it in notepad, and past the contents here.
Thanks,
Adam
by jawilson
30 Mar 2011, 21:03
Forum: BCI Systems - User Applications
Topic: StimulusPresentation offline classifier training
Replies: 2
Views: 1824

Re: StimulusPresentation offline classifier training

Hello, You can use the Offline Analysis tool in Matlab with the stimulus presentation task. You simply use StimulusCode==1 (or 2, 3, etc) for the conditions, and StimulusCode > 0 for the trial change. Unfortunately, this does not automatically generate the classification matrices for you, but it wil...
by jawilson
30 Mar 2011, 20:57
Forum: BCI Systems - Brain Signals
Topic: What's the best reference location to use?
Replies: 1
Views: 2635

Re: What's the best reference location to use?

Alessandro,
Both earlobes and mastoids work fine. Earlobes tend to be a little simpler to setup, since it just requires a clip electrode, but if you have a cap with mastoid electrodes, that will be fine as well.
Adam
by jawilson
20 Mar 2011, 15:30
Forum: BCI Systems - User Applications
Topic: BCI 2000 on 64 Bit Machines
Replies: 1
Views: 1822

Re: BCI 2000 on 64 Bit Machines

This is a bit of an obscure issue. The problem is that the usbamp stores its filter settings in binary files, but they are only in the correct location for 32-bit windows. The solution is to copy the files from C:\Windows\System32 to C:\Windows\SysWOW64. The files have the format DSP*.bin, e.g. DSPf...
by jawilson
03 Mar 2011, 09:12
Forum: Known Issues
Topic: some problems to load .DAT file using EEGLAB
Replies: 2
Views: 2324

Re: some problems to load .DAT file using EEGLAB

Hello, I have just checked the EEGLAB plugin with BCI2000, and everything appears to be working correctly. Please make sure you are following the instructions at: http://bci2000.org/wiki/index.php/User_Reference:EEGLabImport It also looks like your data may have invalid values. You might try loading...