OpenViBE forum

I'm the first one in my lab who want to try neurofeedback.
In which I've been facing some problem and couldn't solve the problem by myself.

I was trying to replay the'threshold_movement_calibration' and what
happened was
1: mean and variance is always X
2:There's only mean and no variance
3:I tried to use the time base epoching inside of stim base epoching,
I can only get the mean but couldn't get the variance.

PS: In the beginning, it shows me the error of over lopping so I moved
stim base epoching before the time based epoching.

HI, Give me more détail what is this scenario ?
Thibaut

Dear Thibaut

Thank you for your reply,

Sorry for the late reply,

Here what I made. If use the stim based epoching both mean and variance has no value.(Although might be the lua file befor I recreate the file I update the demo one and it only give the mean value without variance). So I tried time based instead and only gets the mean value.

What can I do to get both mean and variance value.

Regards,
Felix

PS: If i use the demo loop (which is the stim based epoching before the Univariate Statistics) stim based epoching gives me the message:
ERROR ] At time 1.625 sec <Box algorithm::(0x2b08ed95, 0x74b91d79) aka Stimulation based epoching> {Error description} : {Stimulation Based Epoching can not work on overlapping signal}, {Error type} : {ErrorType::Internal (code 2)}, {Error location} : {C:\ovm-m\sdk\plugins\processing\signal-processing\src\box-algorithms\epoching\ovpCBoxAlgorithmStimulationBasedEpoching.cpp::116}
[ ERROR ] {Error description} : {Box algorithm <Stimulation based epoching> processInput function failed}, {Error type} : {ErrorType::Internal (code 2)}, {Error location} : {C:\ovm-m\sdk\kernel\src\kernel\player\ovkCSimulatedBox.cpp::231}
[ ERROR ] {Error description} : {Process failed for box with id (0x2b08ed95, 0x74b91d79)}, {Error type} : {ErrorType::Internal (code 2)}, {Error location} : {C:\ovm-m\sdk\kernel\src\kernel\player\ovkCScheduler.cpp::746}
[ ERROR ] Scheduler loop failed.

In this case, if I use the time based epoching it gives me only mean value.

Your first Time Based epoching Is 25s duration. So you must wait 25s to have output.
Thibaut

Dear Thibaut

Thank you for your reply. I fixed everything else but this one.

Sorry for the lack of information before, here's my scenario and the problem is that I still can only gets the mean value and can't get the variance value.(like the pic that I uploaded)

Therefore I can't get the threshold value that I need. What should I do to fix this.

Waiting for your reply.
Regards,
Felix

PS:
I tried it on the old version of OPENVIBE.

(openvibe 1.2.0 & BIOSEMI MK2)

I put 'stim based epoching' back to the original order(Like in the pic#1), and the result is that

1: Signal seems wrong( which works fine if I use OPENVIBE 2.2)(Like Pic#2)

2: Which let to an incorrect value (Like Pic#3)

What might causing this?

Regards,
Felix

Hi,
I did a scenario that works (with a lot of commentary). I have make both a common use and the use i think you wan't.
Thibaut