Use of OpenVibe Stimulations for epoching

About BCI and box tutorial/demo scenarios bundled with OpenViBE.
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openvibeexplorer
Posts: 16
Joined: Wed Mar 18, 2020 2:48 pm

Use of OpenVibe Stimulations for epoching

Post by openvibeexplorer »

Hello there,

As far as I know, P300-Speller scenario uses "OVTK_StimulationId_Target" and "OVTK_StimulationId_NonTarget" stimulations during its "training" mode for epoching. P300-Speller also uses "OVTK_StimulationId_VisualStimulationStart" during its "online" mode for epoching.

Question 1 - Shouldn't we use same stimulations for "training" and "online" mode for epoching, to get correct classification and prediction results?

Question 2 - Could you please help me know functional differences among below set of stimulations - if any

1. OVTK_StimulationId_Target and OVTK_StimulationId_NonTarget
2. OVTK_StimulationId_VisualStimulationStart
3. OVTK_StimulationId_Label_01 // 33025
OVTK_StimulationId_Label_02 // 33026
OVTK_StimulationId_Label_03 // 33027
OVTK_StimulationId_Label_04 // 33028
OVTK_StimulationId_Label_05 // 33029
OVTK_StimulationId_Label_06 // 33030
OVTK_StimulationId_Label_07 // 33031
OVTK_StimulationId_Label_08 // 33032
OVTK_StimulationId_Label_09 // 33033
OVTK_StimulationId_Label_0A // 33034
OVTK_StimulationId_Label_0B // 33035
OVTK_StimulationId_Label_0C // 33036

LrnzMrn
Posts: 1
Joined: Mon Oct 18, 2021 9:45 am

Re: Use of OpenVibe Stimulations for epoching

Post by LrnzMrn »

Hi openvibeexplorer,
Forgive me, I don't have an answer to your question but it happens that I have your same doubts about OVTK_... labels.
Did you managed to understand the difference between the different sets of stimulations?

openvibeexplorer
Posts: 16
Joined: Wed Mar 18, 2020 2:48 pm

Re: Use of OpenVibe Stimulations for epoching

Post by openvibeexplorer »

Hello there,

Below is what I assumed and could move forward. I am using C++ terminology to explain my understanding.

- "VisualStimulationStart" might be the Base stimulation.
- "Target" and "NonTarget" might be the SubClasses of Base stimulation.
- Base stimulation "VisualStimulationStart" might be having Label_01, Label_02 .. Label_0C as Enums. So it can be used across "Target" and "Non-Target".

Regards,
Swati.

Thibaut
Posts: 234
Joined: Wed Oct 31, 2018 9:14 am

Re: Use of OpenVibe Stimulations for epoching

Post by Thibaut »

Hi,
Stimulation Code is juste a number to identifier after all. If you wan't to use only OVTK_StimulationId_Label_XX for all of your stimluation it's your choice. Just your analysis and data sharing can be hardest. Stimulation with prefix GDF_ correspond with standard code of gdf format (for eeglab analysis in matlab for example it's simpliest.)
Thibaut

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