OpenViBE forum

Hey Jussi,
sorry for my late reply. Understood, thanks for the detailed explanation, much appreciated.

Yes it would be greatly appreciated if you can bring it up for more detailed documentation, it would help fellow researchers, like myself

Many thanks once again

Patrick

Hi, I am not an expert in programming and I did not manage to reverse engineer the math function used for the following boxes from the code. So my question is, what are the exact formulas used for the "xDAWN Trainer" box and the "Classifier Trainer" utilising "LDA"? I have found bits and pieces onli...

Thanks for the detailed explanation Jussi... made my life easier Working fine now.

Thanks
Patrick

Hey Jussi, trying to do some offline epoch outside of eeglab and found this. I got everything apart from what you mean by "yourGuessedDurationInSeconds" ? Lets say I indexed 33285, 33286 (target & nontarget) and my flash duration is 0.1 and non flash 0.08 with 12 repetitions per trial, hence the val...

Hey Jussi, really sorry, totally forgot to reply on this. Yes matlab version is working fine, although I still have to tweak it; but overall its functioning. I spent some time today working on openvibe again and after some tweaks I managed to get the scenario to work on OpenVibe1.3 version but not o...

Hey Jussi, thanks for your reply. I understand. I tried installing again the new version from scratch, tried a different PC and a different OpenBCI board but all with the same result of 'A' prediction. I finally gave up and built a Matlab version and working on that at the moment. However if you wan...

Hey Jussi, as per my previous post, I downgraded to Openvibe 0.1.8 with the "p300-codapt-stimulator" and after a couple of tries and some settings changed, it worked. In the next few days I will reinstall the new version and try again from scratch, maybe I missed something. If you have any other ide...

Hey Jussi, sorry for my late reply, been hectic the past weeks. I have tried Jeremy's python (with generic acquisition) instead of OpenBCI acquisition, but it still gave me all as no hits and display only 'A' both in replay of the train and online. Tomorrow I will be trying to revert back to Openvib...

One last thing, I had to eliminate the "Signal Decimation" due to OpenBCI 250 sampling rate (or set it to 2 which is to only multiplier that works for both sampling rate and sample count per buffer). That shouldn't affect the results, am I correct? Will report my results by tomorrow on the generic s...

Hi Jussi, I can understand and relate :) 1) will do 2) tried to tweak the classifier, I set it from 3 output channels to 2 and to 1 and changed countless settings. If I understand correctly if I run the acquisition (scenario 1) and I replay it in scenario 5, it should give me the correct output lett...

Hi Jussi, thanks for your prompt reply. I can visually see the P300 effect when I put a Signal Display box when running the replay. I can send you the data if you want to check (however need your email address). Today and tomorrow I will try to run Jeremy's python script and the Generic Streamer acq...

I also forgot to mention, if I run the acquisition recording on the reply, it shows only A as result as well. So the problem is not actually within the train and classifier scenario.

Hi Jussi, I am a PhD student doing my studies on BCI. I am currently using OpenBCI and was evaluating the P300 on OpenVibe, however like the post says I am always getting an A. These are to answer your comments: The dataset download from the website ran perfectly. I am not running any VM. I am runni...

I am having exactly the same issue, did anyone manage to find a solution ?

Thanks
Patrick