Search found 22 matches

by etc
Sat Apr 10, 2021 6:24 pm
Forum: Discussion about BCI and related topics
Topic: A question about the “Epoch averaging” in BCI P300
Replies: 0
Views: 13

A question about the “Epoch averaging” in BCI P300

A question about the “Epoch averaging” in BCI P300. Sorry for my bad English! I suppose: 1) 250 hz, then I have a sample every 4 ms.; 2) 4 channels; 3) in “Stimulation based epoching” I set 0-0,4; 4) then, I have this matrix output from “Stimulation based epoching”: time0 ch1, time0 ch2, time0 ch3, ...
by etc
Thu Jan 07, 2021 1:28 pm
Forum: Discussion about BCI and related topics
Topic: Epoch duration
Replies: 4
Views: 710

Re: Epoch duration

Thank you very much!!!
Ettore
by etc
Tue Jan 05, 2021 11:13 am
Forum: Tutorial scenarios
Topic: With the 3.0.0, in P300 Online or Replay, the selected characters are not showed
Replies: 3
Views: 746

Re: With the 3.0.0, in P300 Online or Replay, the selected characters are not showed

Thank you!
They are the same scenarios (P300 speller and P300 speller Xdawn) with the same your datasets in input (training and online dataset, both with date 2016-04-20).
When you'll give a look, if I can help you, I can give to you other infomations about my tests to understand the problem.
Ettore
by etc
Tue Dec 22, 2020 12:48 pm
Forum: Tutorial scenarios
Topic: With the 3.0.0, in P300 Online or Replay, the selected characters are not showed
Replies: 3
Views: 746

With the 3.0.0, in P300 Online or Replay, the selected characters are not showed

Sorry for the inconvenience! I know I asked many questions in the past, but now I have a very bad problem with the new version 3.0.0 (December 2020) ! I would work with the new version also because I would use the Artefact detection. The problem: the problem is the same working with P300 Speller or ...
by etc
Fri Dec 11, 2020 6:49 pm
Forum: Discussion about BCI and related topics
Topic: P300 accumulator- number of stimulations
Replies: 2
Views: 323

Re: P300 accumulator- number of stimulations

Dear Fabien, thank you for your answer! 1) about the p300 accumulator, I am sure that if I indicate in the box Epoch Average the parameter Epoch Block Average with Epoch Count 2 or greater, the P300 accumulator doesn’t work. Because the number of epochs is less than the number of flashes and the Acc...
by etc
Sat Dec 05, 2020 12:43 pm
Forum: Discussion about BCI and related topics
Topic: P300 accumulator- number of stimulations
Replies: 2
Views: 323

P300 accumulator- number of stimulations

Scenario BCI-P300 speller. New version 3.3.0, but it is the same with the old one. I gave a look to the P300 Accumulator code to try to understand the reason of a problem(the problem was that the results, i.e. the characters selected, were not showed). I read this note in the code: “-- the idea is t...
by etc
Sun Nov 22, 2020 1:06 pm
Forum: Discussion about BCI and related topics
Topic: Classifier: Incremental Learning
Replies: 7
Views: 698

Re: Classifier: Incremental Learning

Dear Thibaut,
after a lot of tests, I succeeded!!!
Thank you very much for the scenario that you built to get this other option to concatenate 2 files!
Ettore
by etc
Thu Nov 05, 2020 10:55 am
Forum: Discussion about BCI and related topics
Topic: Classifier: Incremental Learning
Replies: 7
Views: 698

Re: Classifier: Incremental Learning

Dear Thibaut,
I put on Filter Box the parametr that you can see in the attached image. The filter box is only for the first file.
Now, the train classifier worked only for the second part of the concatened file... .
Where am I wrong?
Thank you
Ettore
by etc
Thu Nov 05, 2020 9:40 am
Forum: Discussion about BCI and related topics
Topic: Classifier: Incremental Learning
Replies: 7
Views: 698

Re: Classifier: Incremental Learning

Sorry, dear Thibaut! Give a look to the next my answer!
by etc
Tue Nov 03, 2020 10:29 pm
Forum: Discussion about BCI and related topics
Topic: Classifier: Incremental Learning
Replies: 7
Views: 698

Re: Classifier: Incremental Learning

Dear Thibaut, I would say to you: THANK YOU!!! Now, I didnt'understand what I have to do when you wrote "You must just remove the stimulation who run the train on all scenario except the last". And I tested the new little scenario, but I didn't remove anything. I only wrote, in your new scenario, th...
by etc
Sat Oct 31, 2020 6:13 pm
Forum: Discussion about BCI and related topics
Topic: Classifier: Incremental Learning
Replies: 7
Views: 698

Classifier: Incremental Learning

Before to ask my question, congratulation for the new versione 3.0.0!!! I have a question to try to train better the classifier. I think that the argument is known as “incremental learning". Now: -I am on Openvibe 2.2.0 -I run the scenario P300-speller-1-acquisition; the Generic-stream-writer writes...
by etc
Sun Oct 11, 2020 9:33 am
Forum: Discussion about BCI and related topics
Topic: Epoch duration
Replies: 4
Views: 710

Re: Epoch duration

Thank you very much Thibaut for your answer! Sorry for the delay of my new answer: I had the fever! You remember very well! I am tryng to work with the P300 Speller scenario. The question is: if (for i.e.): 1) in the box "P300 stimulator" (in the P300 Speller acquisition) I indicate a flash duration...
by etc
Sat Oct 03, 2020 10:22 am
Forum: Discussion about BCI and related topics
Topic: Epoch duration
Replies: 4
Views: 710

Epoch duration

Sorry for my bad English! In this example: Flash duration: 0.1 No flash duration: 0.5 Epoch duration: 1.2 sec., I think that a target-epoch (i.e. with the start from the stimulation target), will get the EEGs for one target stimulation and also for one no-target stimolation. Is this a problem for th...
by etc
Thu Jul 09, 2020 6:43 pm
Forum: Discussion about BCI and related topics
Topic: jaw clenching, artifact removal in P300 scenario.
Replies: 6
Views: 1591

Re: jaw clenching, artifact removal in P300 scenario.

Dear Thibaut, sorry for my bad English! I read your suggestion for me " if you build OpenViBE from source, you can use the box artefact detection with 70 to 100 as parameter" and I installed another Opnevibe from source! The job was very hard...! But I installed the product. But now I dont'see the b...
by etc
Tue Jun 30, 2020 12:53 pm
Forum: Discussion about BCI and related topics
Topic: jaw clenching, artifact removal in P300 scenario.
Replies: 6
Views: 1591

Re: jaw clenching, artifact removal in P300 scenario.

Thank you very much, Thibaut!!!
I think that because my 6-7 questions are related to a lot of boxes and to a lot of terms about P300, it will be more clear to open a new post.
I need some time to try to write in clear English (Sigh!!!) my questions!!!!
Thank you very much!!!
Ettore