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Data in each step of a Visuall P300 Speller

Posted: 11 Jun 2015, 13:11
by bertocasta
Hi,

I'm trying to perform an analysis of a P300 Visual Speller and I need to get some figures of the data. I've acces to raw data (files .dat created by the BCI2000 application). As long as I know, the processing steps are as follow:

*Spatial Filter (CAR or others)
*Dividing in epochs and averaging
*Classifcation

I need to get the data after the CAR Filter and the epochs aswell. Is there any way to acomplish this?

Thank you.

Regards, Alberto.

Re: Data in each step of a Visuall P300 Speller

Posted: 11 Jun 2015, 14:11
by pbrunner
Alberto,

BCI2000 provides the Offline Analysis tool for this purpose [1]. Alternatively you can import the data into MATLAB using the load_bcidat mex interface [2], or into other programs using the ASCII files that the BCI2000Export tool creates [3].


Regards, Peter

[1] http://www.bci2000.org/wiki/index.php/U ... e_Analysis
[2] http://www.bci2000.org/wiki/index.php/U ... _MEX_Files
[3] http://www.bci2000.org/wiki/index.php/U ... 2000Export

Re: Data in each step of a Visuall P300 Speller

Posted: 11 Jun 2015, 14:35
by bertocasta
Hi again, Peter,

I've tried to use all of these options.
[1] Offline Analysis only allows me to plot the r-squared value or target/non-target stimulus for a given channel and time interval.
[2] I've sucessfully loaded the XXXXXX.dat file. But at this point, no processing is done. I only have the raw data.
[3] Same as [2]

So what I pretend is to get the data after the CAR SpatialFilter but before epoching, after epoching but before classifying and after classifying.

Regards, Alberto.

Re: Data in each step of a Visuall P300 Speller

Posted: 11 Jun 2015, 14:43
by pbrunner
Alberto,

try the BCI2000 P300 GUI that was bundled until v2.0 [1]. No guarantees that it will still work, but if you run that in MATLAB you have access to all intermediate steps.

[1] http://tinyurl.com/pokjwbr

Regards, Peter