Search found 42 matches

by chantrip
Fri Sep 23, 2011 8:24 am
Forum: Designer
Topic: P300 speller: Modify how the alphabets flash
Replies: 14
Views: 16765

Re: P300 speller: Modify how the alphabets flash

Hi jlegeny Thank you very much for your response. I plan to modify the function _cache_for_each_if_ so that it takes the flashing pattern as an input instead of iLine and iColumn. The setting should be (from Line 687 of ovpCBoxAlgorithmP300SpellerVisualisation.cpp) void CBoxAlgorithmP300SpellerVisua...
by chantrip
Thu Sep 22, 2011 5:41 am
Forum: Designer
Topic: P300 speller: Modify how the alphabets flash
Replies: 14
Views: 16765

P300 speller: Modify how the alphabets flash

I would like to modify how the alphabets flash. In the P300-speller with xDawn, every alphabet in the same row or column flash simultaneously e.g. the alphabets A, B, C, D, E, F which lie in the first row flash simultaneouly and so on with other alphabets in other rows/columns. Let's call this Row/C...
by chantrip
Wed Sep 21, 2011 9:50 am
Forum: Designer
Topic: P300 flashing sequence modification
Replies: 3
Views: 3896

Re: P300 flashing sequence modification

I found this link viewtopic.php?f=3&t=329 and not sure if this is the one that I want. However, is there any tutorial or read-me file to explain the programming structure in the file 'ovpCBoxAlgorithmP300SpellerVisualisation.cpp'?

Thank you very much

-Jim
by chantrip
Tue Sep 20, 2011 6:35 am
Forum: Designer
Topic: P300 flashing sequence modification
Replies: 3
Views: 3896

Re: P300 flashing sequence modification

Thanks Laurent for a quick response. However, what I want to modify is how the alphabets flash, not the output sequence. In the conventional P300 scheme, alphabets are flashed in a row/column scenario e.g. every alphabet in the row 'A B C D E F' flash simultaneously. Can I modify the flash such that...
by chantrip
Mon Sep 19, 2011 4:55 am
Forum: Designer
Topic: P300 flashing sequence modification
Replies: 3
Views: 3896

P300 flashing sequence modification

Dear all I've tried P300-speller with xDAWN using row-column (RC) flashing and everything works fine (so far). I'd like to know how to modify the flashing sequence such that only specified letters are flashed. For example, from P300-speller, instead of the row 'A B C D E F' flashing, how to modify t...
by chantrip
Fri Aug 19, 2011 4:46 am
Forum: Scenarios and BCI design
Topic: Help with motor imagery
Replies: 3
Views: 3288

Re: Help with motor imagery

Hi Laurent

Thank you very much for your information. I downloaded and installed openvibe-0.11.0 in my windows XP machine. How to connect my Emotiv headset with the Acquisition server since I don't see EPOC emotive in the list of the driver?

Thank you

-Jim
by chantrip
Wed Aug 17, 2011 7:04 am
Forum: Scenarios and BCI design
Topic: Help with motor imagery
Replies: 3
Views: 3288

Help with motor imagery

Dear all I'm using Emotiv headset and working on the motor imagery scenario. I started from motor-imagery-0 file to monitor the signal status, then with motor-imagery-1 file to collect some training data. However, when I tried motor-imagery-2 to train the LDA classifier using the data obtained when ...
by chantrip
Wed Aug 17, 2011 6:26 am
Forum: Designer
Topic: Replace the letters in P300 application with pictures
Replies: 4
Views: 4382

Re: Replace the letters in P300 application with pictures

Thank you very much for your quick response. It works fine now :).
by chantrip
Tue Aug 16, 2011 8:37 am
Forum: Designer
Topic: Replace the letters in P300 application with pictures
Replies: 4
Views: 4382

Replace the letters in P300 application with pictures

Hi I'm working on P300-speller-xDawn application using Emotiv headset. I'd like to replace the letters in P300 spelling box with pictures (say D:\Pic\snoopy.jpg) by modifying the file p300-speller.ui. Based on the quote 2. It is possible, you will have to edit the .ui file in Glade Interface Designe...
by chantrip
Thu Aug 04, 2011 6:45 am
Forum: Scenarios and BCI design
Topic: [Error] <xDAWN Spatial filter> -Bad matrix size
Replies: 7
Views: 13200

Re: [Error] <xDAWN Spatial filter> -Bad matrix size

Great ! How many letters do you manage to detect successfully ? I got 10 out of 10 :). From one session to another, the electrodes may be in a slightly different position, thus the spatial filter need to be trained again. Even from one day to another, your "mental state" could be different from the...
by chantrip
Wed Aug 03, 2011 9:51 am
Forum: Scenarios and BCI design
Topic: [Error] <xDAWN Spatial filter> -Bad matrix size
Replies: 7
Views: 13200

Re: [Error] <xDAWN Spatial filter> -Bad matrix size

Dear Laurent Thank you very much for your helpful comments. It turns out that I've made a mistake when selecting data to train xDAWN spatial filter :(. After correcting and increasing the oversample factor from 1 to 4, I was able to get 75.27% classification rate and get very good results when tryin...
by chantrip
Mon Aug 01, 2011 8:42 am
Forum: Scenarios and BCI design
Topic: [Error] <xDAWN Spatial filter> -Bad matrix size
Replies: 7
Views: 13200

[Error] <xDAWN Spatial filter> -Bad matrix size

Dear all I'm a newbie to Openvibe and trying p300-speller-xDAWN. I use openvibe-0.10.0-svn2909-src with Emotiv headset. I followed the thread in http://openvibe.inria.fr/forum/viewtopic.php?f=17&t=401 and got stuck in the training phase. When I started -4-online-xml, the log file showed that xDAWN f...