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PostPosted: Wed Aug 09, 2017 9:22 am 
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Joined: Wed Aug 09, 2017 2:51 am
Posts: 1
Hi everyone

This is my first post in this forum. I just started to use Openvibe to build BCI using Emotiv EPOC+.

Having read related posts in this forum, I chose the scenario with CSP to run motor imagery. Since Emotiv cannot cover C3 and C4, during the testing, I have the headset tilted.

In the first testing, I used the original CSP example. The classification performance is only 60%. During the online session, the classification result is not stable which makes it hard to calculate the performance. It is always like, the classifier first gives a left bar and then shifts to a right bar, or the opposite.

So in the second testing, I added a Channel Selector which selects the two nodes above C3 and C4 before the Temporal Filter. But the classification performance during the training and online session is almost the same.

My question is: am I doing something wrong here? Is there anything I can do to improve the accuracy, or at least makes the prediction from the trained classifier stable?

Previous posts recommend Emotiv may work with ssvep and P300. So I also tried the P300 speller. But again the results were frustrating. The prediction is always A in the end. Could someone give me some advice on this as well?

I will appreciate any light into this.

Thanks,
Chandler


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PostPosted: Wed Aug 09, 2017 12:11 pm 
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Joined: Thu Feb 09, 2017 10:17 am
Posts: 51
Hi,

After discussing with some colleagues, it seems that they had problems in the past due to the amount of noise on the signal with this headset.
Could you test your signal quality using emotiv software, to see if this is a signal quality problem or not ?

Cheers,


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PostPosted: Tue Sep 12, 2017 7:35 am 
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Joined: Tue Dec 04, 2012 3:53 pm
Posts: 573
Location: INRIA Rennes, FRANCE
Agree with tgaugry, though it might be difficult to say much about signal quality without an expert eye. You can check that the impedances are ok though, with the emotiv panel.

My three cents are in this old thread,

viewtopic.php?f=17&t=9610

Also, xDAWN P300 should work better on random, non-experienced users than motor imagery. I don't have personal experience with either paradigm on Emotiv though.


Cheers,
Jussi


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