Search found 14 matches

by ariel
22 Apr 2009, 16:23
Forum: Software Development
Topic: Audio and visual stimulus delay
Replies: 2
Views: 1876

Dear Grev:

Thank you very much for your reply.
In view of the comment on the hardware, our concern would be if we could introduce few lines of code into the source to cause a delay of the visual stimulus. If this can be done, we would appreciate if you could point out in what place do it.

Ariel
by ariel
21 Apr 2009, 11:08
Forum: Software Development
Topic: Audio and visual stimulus delay
Replies: 2
Views: 1876

Audio and visual stimulus delay

I wonder if there is any way to change the delay time between the auditory stimuli and visual stimuli in the application P3Speller? When I see the stimuli output on an oscilloscope, the auditory stimulus appears about 50ms after the visual stimulus. We will like to get a zero delay or the posibility...
by ariel
22 Mar 2009, 22:26
Forum: Known Issues
Topic: IconHighLightMode
Replies: 0
Views: 2391

IconHighLightMode

In the application P3Speller when choosing IconHighLightMode 3, only inverts a few colors and other changes to the black. Therefore, we would like to know if the colors have to comply with any rule or is this a program error.

Ariel
by ariel
17 Mar 2009, 13:06
Forum: Known Issues
Topic: P3Speller error
Replies: 1
Views: 1948

P3Speller error

During the execution of our application errors occur at random in the module P3Speller.exe, jumping posters as: P3Speller.exe error "Assertion failed: TP2, xxtype.cpp file line 262" P3Speller.exe error "Assetion failed: topTypPtr! = 0 & & IS_STRUC(topTypPtr-> tpMask), file xxtype.cpp, line 847" What...
by ariel
04 Mar 2009, 18:58
Forum: Configuration
Topic: System Timings
Replies: 14
Views: 4527

We agree that there is a problem inside the Source module. However, this problem does not affect the acquisition of the signal, though it affect the times in which the visual stimuli are shown. In the pictures you can see the signal acquired on channel 1 of our acquisition board. This signal comes f...
by ariel
03 Mar 2009, 09:21
Forum: Configuration
Topic: System Timings
Replies: 14
Views: 4527

Gerv

Thank for your new reply. Here the images in original size.

The timings with our acquisition board:
Image

The timings with SignalGenerator:
Image

Ariel
by ariel
02 Mar 2009, 21:46
Forum: Configuration
Topic: System Timings
Replies: 14
Views: 4527

Thank for your reply Gerv, and sorry for that short info! Here is a little more information: We are dealing with a board of six channels, but with six independent successive-approximation A/D converters, more precisely, a Data Transaltion DT9816 USB-Econo Serie (16-bit , ±10 V or ± 5 V, 50 kS/s per ...
by ariel
02 Mar 2009, 14:52
Forum: Configuration
Topic: System Timings
Replies: 14
Views: 4527

System Timings

We are using DT9816ADC as signal source. Because this board acquires channels simultaneously, we have modified the source code on "\BCI2000__source_v2\src\contrib\SignalSource\DTADC\DTADC.cpp" by altering the line dtfun.ConfigAD( OL_CHNT_SINGLEENDED, channels, gain, 0, /*channels **/ samplerate, (UI...
by ariel
18 Feb 2009, 22:12
Forum: Software Development
Topic: Cell by cell stimulation
Replies: 0
Views: 2644

Cell by cell stimulation

We would like to change the way the stimuli in P3Speller are presenting, in order to stimulate cell by cell the target matrix (e.g. in single element way) instead of the classical row and column stimuli. Please, could you help us on this aims or to point out where is defined this associations of ele...
by ariel
15 Feb 2009, 00:23
Forum: Known Issues
Topic: Configuration in nested matrix
Replies: 1
Views: 1728

Configuration in nested matrix

I have had problem setting nested matrix: If I don´t set 5 columns in a matrix in TargetDefinitions (eg. setting 3 or 4) then System Log says: "P3SpellerTask::Preflight: Application: Index out of range when accessing a parameter value, terminating module." If I set in TextToSpell a character that ex...
by ariel
02 Oct 2008, 21:36
Forum: Known Issues
Topic: p3speller audio stimuli
Replies: 6
Views: 2654

Juergen,

Thanks for solving the problem. We will continue with the experiment.
by ariel
02 Oct 2008, 11:00
Forum: Known Issues
Topic: p3speller audio stimuli
Replies: 6
Views: 2654

We are starting up from P3Speller_SignalGenerator.bat, then load parms\p3_tutorial\InitialP3Session.prm, and check the AudioStimuliOn parameter's checkbox. The matrix`s size are set to 3x3. We are using the wav files wich are in \prog\sounds. The wav files: 1, 2, 3 are placed in AudioStimuliRowsFile...
by ariel
01 Oct 2008, 14:42
Forum: Known Issues
Topic: p3speller audio stimuli
Replies: 6
Views: 2654

We use P3Speller_SignalGenerator.bat and check the audio stimuli box. What happens is that when the program is covering rows and columns sometimes skips the visual stimulus and other times skips the hearing stimuli.
by ariel
30 Sep 2008, 10:16
Forum: Known Issues
Topic: p3speller audio stimuli
Replies: 6
Views: 2654

p3speller audio stimuli

Hi: We are using BCI2000 and trying to do experiments with audio P3Speller. We checked the "Audio Stimuli Mode", and used the audio stimuli files that comes with the program. The problem is that during the presentation of the stimulis some visual stimuli is not shown but are displayed auditory and v...