P300 calibration session problem

mattspe · Post by **mattspe** » 30 Nov 2012, 07:03

Hi,
I'm trying to perform a calibration session with p300 speller, following this tutorial:
http://www.bci2000.org/wiki/index.php/U ... on_Session
but I've a problem. The application doesn't change the target letter in the attended word. In my case the word is "THE" and the application loop on the set of the "T" letter.
Any suggestions?
Regards
Matteo

gschalk · Post by **gschalk** » 30 Nov 2012, 07:45

Do you see a matrix? Do you see flashing rows/columns? Do you see the EEG display? Does it seem to update properly?

Gerv

mattspe · Post by **mattspe** » 30 Nov 2012, 08:21

Hi,
yes, I see the p300 matrix flashing in according with parameters I've setted. I also see the eeg activity, shown correctly and, above the window, the word I've written in the "text to spell" form. But it didn't change from "THE (T)". The letter between bracet is the target letter, right? During the variuos sequences it doesn't change in "H".
Thank you for any suggestions.
Matteo

gschalk · Post by **gschalk** » 30 Nov 2012, 09:18

What is the value of the NumSequences parameter?

Gerv

mattspe · Post by **mattspe** » 30 Nov 2012, 09:21

gschalk · Post by **gschalk** » 30 Nov 2012, 21:56

It should change to the H after about 30-60secs or so. Did you wait that long?

Gerv

mattspe · Post by **mattspe** » 01 Dec 2012, 01:59

yes, I've waited for several minutes.

gschalk · Post by **gschalk** » 01 Dec 2012, 19:53

OK. Can you download the latest version of BCI2000 and try this with the stock installation, i.e., without any changes to the parameter files that come with the system? We should be able to establish that this works, and then we can fool with the parameters until it stops working. I have personally never seen the behavior that you describe.

Gerv

mattspe · Post by **mattspe** » 03 Dec 2012, 04:18

Hi!
Thank you for your help. I've just installed again the BCI2000(the version with contribution).
I'm using the emotiv epoc headset.
The only changes I've made from default parameters are:
- channel names
- sourceChGain to 1 for any channel
- highpass filter to 0.1 hz
It's because the system force to do this to start with application.
Now i've the eeg plot working on the screen, the p300 matrix window and the Erp window.
What I need to do to perform a calibration session?
Matteo

gschalk · Post by **gschalk** » 03 Dec 2012, 08:06

The calibration session is described in the P300 tutorials on doc.bci2000.org.

My question is whether you get the advancing of the characters now? If not, how about using the SignalGenerator batch/parameter files?

Gerv

mattspe · Post by **mattspe** » 05 Dec 2012, 05:11

Now the target letter changing seems to work.
I don't know why.

bci2000.org BBS

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