OpenViBE forum

Hi all,

I'm wondering what are the default configuration used for the LDA classifier and how can I change them?

Thank you for your help
Cheers

Hi Laurent, Thanks a lot for your helpful responds and valuable time :wink: For the three points mentioned above, I’ve the following questions: 1. For the figures I want to make, I just intend to make a figure of the p300 brain wave and compare it with non-target brain wave. I need to see the respon...

Few more questions :?: •I’d like to know what type of windowing is used for the P300 speller? Is it a simple event related time framing? As I understand, the classifier use only the data that is collected 300 mSec after each column and row flash, is this correct? •What is the Information Transfer Ra...

Dear yrenard and lbonnet, I’d like to thank you for your great support and fast response, and I’d like to wish all openvibe team a merry Christmas and Happy New Year. Finally, I gained very good results using the P300 speller, but I used the online scenario to record the training data and then test ...

Hi everyone, I would like to check the frequency of the P300 brainwave when the target letters are flashing and after 300-500 mSec of the flash, in order to make figures and data analysis of these information to know whether a specific person have a strange/distinguished P300 brain wave or weak/undi...

Hi stede,

Thanks a lot for your help. Will try and see

Best regards,

Hi setde, I'd like to thank you for your comments here that I support. I'm also working with P300 speller and face the same problem. I'm wondering if you have used the online scenario, and what is you reflection about it? I got accuracy range of 60-85% during the training. However, I did not get any...

I do not get a "train successfull" message at the end of training the LDA classifier??

Yes, I do the steps just as you mentioned but when I do the online testing, I get this error. This is the information from the log folder [ ERROR ] Plugin code caused crash 1 (0x1) time(s) [ ERROR ] [name:LDA classifier - GPL] [ ERROR ] [class identifier:(0xd7183fc7, 0xbd74f298)] [ ERROR ] [location...

Thank you so much Dieter One last qustion is: what is the reason for this error which I got when I use any online scinario “Plugin code cause crash 1(0x1) time(s) [name: LDA classifier-GPL] [class identifier: 0xd7183fe7, 0xbd74f298] [location::process callback]”??? Your help is approciated. Cheers

Hi everyone, I’m do not quite understand what are the differences between the training scenario for P300 speller and the online scenarios? The layout looks very different, however, the differences on functionality are not clear to me. Also, I’d like to know if the accuracy showing at the end of trai...

The previous error was because I trained SVM classifier and then used LDA online by mistake :lol: Unfortunately, I have this error now “Plugin code cause crash 1(0x1) time(s) [name: LDA classifier-GPL] [class identifier: 0xd7183fe7, 0xbd74f298] [location::process callback]”??? Another question is: i...

Thank you Laurent for your help :wink: I’ve concerns about the accuracy of the P300 speller with xDAWN filter. SVM classifier was trained for 12 sessions and the average accuracy was 83.33%. However, when I used the online scenario, I didn’t get any letter right :cry: all targets were wrong. Did you...

Hello everyone, I’ve some questions regarding the p300 speller scenario: •K-fold testing costs long training time, are there other means to use for P300 speller? •How can I remove artifact from my data? I'd like to investigate artifact removal filters on openvibe if any. •Why the 'channel selector' ...

I’m using some of the available scenarios in openvibe, e.g. the acquisition scenario for the speller with xDawn filter, but I have this error “Acquisition client box has been deactivated because process phase returned bad status”..What does this mean?? I’m using Emotive and it works well, and I’ve u...