Search found 40 matches

by nfoy
Tue Jul 05, 2016 3:24 pm
Forum: Scenarios and BCI design
Topic: Recreate Region Based Speller
Replies: 1
Views: 1619

Re: Recreate Region Based Speller

Hi I believe that the P300 speller xDawn is a good start to implement the behavior you want. You can for instance create a Lua script to implement any flashing strategy and connect it to the P300 Visualisation box. The configuration file p300-speller-visualisation.cfg will allow you to modify the di...
by nfoy
Thu Jun 30, 2016 10:00 am
Forum: Acquisition server and drivers
Topic: Sending External Stimulation
Replies: 10
Views: 11161

Re: Sending External Stimulation

Hi klaro, I think the problem you have is related to the fact that 'bytes' is different in python2 and python3. The example script was written for python 3. All you have to do is to replace bytes by bytearray. This should work for both python 2 and python 3. The example script will be changed accord...
by nfoy
Thu Jun 23, 2016 1:10 pm
Forum: Help for building the software
Topic: help building open vibe
Replies: 3
Views: 3633

Re: help building open vibe

Hi, OpenVibe mainly supports 3 systems: Windows, Ubuntu and Fedora. It might work on other platforms but with more effort. If you want to avoid hacking to make it work on your system (which can be time-consuming and tedious), I recommend you to use one of the supported platforms (http://openvibe.inr...
by nfoy
Tue Jun 21, 2016 1:35 pm
Forum: Help for building the software
Topic: help building open vibe
Replies: 3
Views: 3633

Re: help building open vibe

Hi Natacha
Could you please tell about the system on which you're trying to install OpenVibe ?
Cheers
by nfoy
Tue Jun 21, 2016 1:33 pm
Forum: Designer
Topic: How do I go for more than 2 to match brain wave data?
Replies: 1
Views: 2334

Re: How do I go for more than 2 to match brain wave data?

Could you please give more information about your setting ? What information do you intend to match ?
by nfoy
Fri May 20, 2016 4:43 pm
Forum: OpenViBE News
Topic: OpenViBE v 1.2.0 is available (+ v1.2.1 + v1.2.2)
Replies: 4
Views: 10396

Re: OpenViBE v 1.2.0 is available

Release Notes / ChangeLog version 1.2.0 Tests: Added Shrinkage LDA tests to the build automation Demos: Updated the Motor Imagery scenarios to use TCP Tagging Build: Addressed Ogre/CEGUI Find problems on Fedora 21 Plugins: Fixed problem of xval setting placement in Classifier Trainer Applications: D...
by nfoy
Fri May 20, 2016 4:24 pm
Forum: OpenViBE News
Topic: OpenViBE v 1.2.0 is available (+ v1.2.1 + v1.2.2)
Replies: 4
Views: 10396

OpenViBE v 1.2.0 is available (+ v1.2.1 + v1.2.2)

The OpenViBE development team is happy to announce the release of v1.2.0. You can find it here . Highlights OpenViBE 1.2.0 comes with many improvements of the general quality of the code base. New tests have been added to extend the code coverage and assess sensitive parts of the project such as tim...
by nfoy
Wed May 18, 2016 6:14 pm
Forum: Scenarios and BCI design
Topic: How to change the classifiers of P300 and SSVEP scenarios?
Replies: 2
Views: 2097

Re: How to change the classifiers of P300 and SSVEP scenari

Hi, With the P300 speller, the processing pipeline includes an XDAWN spatial filter to enhance the classification with LDA. It may have less effect with other classifiers. When working with P300 ERP, the typical electrodes used are: Fz, Cz, C3, C4, Pz, P3, P4, P7, P8, Oz, O1, O2, but it can also wor...
by nfoy
Tue Apr 19, 2016 8:44 am
Forum: Discussion about OpenViBE
Topic: Sending data out from OpenViBE to LABVIEW
Replies: 2
Views: 3095

Re: Sending data out from OpenViBE to LABVIEW

Hi

I suggest to send stimulations with the TCP writer box in OpenVibe and implement basic TCP/IP communication in your LabView program.

Best regards
by nfoy
Fri Apr 08, 2016 2:37 pm
Forum: Designer
Topic: Saving classifier output as trigger in the EEG file
Replies: 3
Views: 3996

Re: Saving classifier output as trigger in the EEG file

Hello,
As far as I understand you don't need hardware trigger nor software trigger. Your Matlab box simply needs to output a stimulation that you connect to your file writer box in the designer.
Hope this helps!
Best regards
by nfoy
Tue Mar 15, 2016 1:30 pm
Forum: Tutorial scenarios
Topic: LDA classifier trainer
Replies: 2
Views: 3880

Re: LDA classifier trainer

Hi LDA in OpenVibe is multiclass, and classifies a vector X in class k = argmax_i { P(class=i | vector=X) } There is one set of weights associated to each class to compute P(class=i | vector=X). For more details: plugins/processing/classification/src/algorithms/ovpCAlgorithmClassifierLDA.cpp and plu...
by nfoy
Wed Mar 02, 2016 10:03 am
Forum: Scenarios and BCI design
Topic: SSVEP-BCI Spatial Filter Box error
Replies: 4
Views: 3247

Re: SSVEP-BCI Spatial Filter Box error

Ok it seems that one of our recent changes screwed things up...
Thank you for reporting this issue!
FYI OpenVibe's bugtracker is hosted there: http://openvibe.inria.fr/tracker/my_view_page.php
Cheers
by nfoy
Wed Mar 02, 2016 9:25 am
Forum: Scenarios and BCI design
Topic: P300 speller co-adapt with Emotiv Epoc - Not working
Replies: 3
Views: 3179

Re: P300 speller co-adapt with Emotiv Epoc - Not working

Hello The P300 Speller coadapt relies on shared memory tagging to send event markers. We have noticed a time drift of the tagging, which degrades the performances of the classifier over time. We are about to release a new version of the P300 Speller which corrects this issue. In the meantime I recom...
by nfoy
Tue Feb 23, 2016 4:06 pm
Forum: Scenarios and BCI design
Topic: SSVEP-BCI Spatial Filter Box error
Replies: 4
Views: 3247

Re: SSVEP-BCI Spatial Filter Box error

Hello These error messages occur when the dimensions of the filter are inconsistent with the number of channels (number of coefficients should be equal to number of input channels * number of output channels) I'm not sure why you get this problem, but this might be due to an irrelevant filter parame...
by nfoy
Tue Feb 02, 2016 11:29 am
Forum: Scenarios and BCI design
Topic: Problem running p300 with Emotiv
Replies: 1
Views: 1889

Re: Problem running p300 with Emotiv

Hi
Could you please describe more the problem you get when connecting the Emotiv headset to the acquisition server? Do you get an error message in the logs?
Thanks