about p300 speller stimulator

[rmatasan]

Hi everyone,

I am working now with the p300 speller stimulator to get stimulations for my box. But I have seen something that I don't understand. To use the speller in combination with my box, I need to change the configuration of the p300 speller and set the number of columns to 2 and the number of rows to 1. When I run the application using this configuration, the console displays the following message: "[WARNING] Box algorithm <P300 Speller Stimulator> has been deactivated because initialization phase returned bad status". Can anyone tell me why??

BEST REGARDS and thank you in advance.

[rmatasan]

I have to add that when you press the stop button, using this configuration, the application crashes.

[yrenard]

Dear rmatasan,

before this message, you probably have the following message :

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This stimulator should have the same number of row(s) and columns(s) (got 2(0x2) and 1(0x1).

In fact, the current P300 Stimulator box currently does not support column count != line count. This is because it flashes one line then one column and so on. If you need different behavior, I suggest that you look at the Lua Stimulator box that will let you write your own stimulation generator for whatever P300 presentation you use.

I hope this helps,
Best regards,
Yann Renard

[rmatasan]

Thanks Renard,

I think that by now I can manage it by using 2 rows and 2 columns. But, by the way, I am not getting the warning message you said:

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"This stimulator should have the same number of row(s) and columns(s) (got 2(0x2) and 1(0x1)."

[yrenard]

Dear rmatasan,

you're right, those messages were deactivated... sorry for the inconvenience, they are back in the latest SVN repository.

Best regards,
Yann