Hi Ariel, I have to agree with Mario mate, it's a strange approach to take. To demonstrate, here is another version of the sample code I posted yesterday but...
Christopher Hatherly
Christopher.Hatherly@...
Nov 4, 2009 10:18 pm
10245
Hi Thank you very much, for the informative answer. I didn't menage to run the code yet, as it stucks my computer,but I'll find the way to run it. from reading...
ariel.goldstien
ariel.goldstien@...
Nov 5, 2009 12:45 am
10246
Hi everyone. I've been trying to setup a new Bits++ box so that I can have precise TTL output, but I am being flummoxed by the BitsPlusPlus function. When I...
So wait..., Are you interested in drawing rects themselves,or are your rects actually pictures that you load from your harddrive? That changes the story.... ...
Don't have an example, but the error is probably due to you not opening the window in one of the Bits+ modes. Seems i need to improve the error handling here. ...
Hi, I am using PTB3 with Matlab R2009a on XP SP3 with a Quadro FX 3400 card. This is used in dual screen mode to display stereo stimuli. This all used to work...
Thank you guys.. It took me a while to understand that in-ordr to save time, all I needed was to pre-allocate the location of the rects... general question...
ariel.goldstien
ariel.goldstien@...
Nov 5, 2009 1:15 pm
10251
Uh oh, it looks like my graphics card isn't good enough. Can you verify that my Nvidia Quadro NVS 280 PCI-E 64mb card isn't going to cut it? Thanks, Tim...
The simple Bits+ mode should work - The one that only allows 255 different colors per image and then applies a classic clut. See e.g., BitsPlusImagingTest,...
I'm having an annoying little problem that I hope someone can help me with. I'm using the built-in matlab function RANDSAMPLE to select a set of starting...
On the systems where you are not getting the behavior you expect, try which randsample -all and see what other items are on the path that are causing the...
loren289
lorens@...
Nov 6, 2009 1:16 pm
10255
... Have you tried adjusting the path to find stats toolbox randsample first? E.g.: >> path([matlabroot '/toolbox/stats'], path) Best, Andreas...
Hi, I am generating a visual stimuli containing moving bars. Basically, I draw bar in new position using Screen('Flip') in my script. I am using ATI HD4350...
leannelaychan
leannelaychan@...
Nov 6, 2009 8:36 pm
10257
Hi Leanne, Could you let us now which OS (and which version) you are using? As far as I'm aware, that can have a big impact on the ability to work with...
Hi, I need to set up an experiment using PTB3 to present visual stimuli and send triggers to an EEG system manufactured by Biosemi. What I am tring to do is...
Thanks, Loren and Andreas. Those were both useful suggestions. The main problem is that I hadn't quite realized it was stats toolbox, not a regular built in...
I doubt this is a driver bug, but maybe something went wrong during the installation of the new drivers? E.g., maybe some old configuration setting trash was...
... Maketexture to present images that were precomputed in Matlab, e.g., by a formula, or images loaded from filesystem via imread() etc. Offscreen windows if...
UpdatePsychtoolbox and issue 2 should solve itself, unless you have an old Matlab version or they were disabled for a good reason, e.g., detected problems. 1....
Hi, I am hunting for a PHP implementation of the QUEST procedure that is available in the PsychToolbox. I would like to be able to do some simple visual...
David Jones
djones@...
Nov 9, 2009 7:15 pm
10265
Depends how many trigger lines you need. A USB-Parallel converter won't work, these don't provide the low-level protocol for controlling TTL lines, only the...
Thanks Dee and Mario for your replies. I am using Windows XP Professional Version 2002 SP3. Any insights? - Leanne...
leannelaychan
leannelaychan@...
Nov 9, 2009 10:22 pm
10267
Run PerceptualVBLSyncTest. If you don't see tearing, but only homogeneous flicker then pageflipping is likely active. I believe it is a false alert, esp. if...
Hi Mario, Thank you very much for your help and suggestions. I think I can live with just 1 line of TTL so the USB-Serial converter option might also work for...
After running PerceptualVBLSyncTest, I saw a big inverted triangle with an exclamation mark. Then, the screen flickered in a homogenous fasion. Afterwards, I...
leannelaychan
leannelaychan@...
Nov 9, 2009 11:29 pm
10270
No. Quit Matlab, restart, retry. You can ignore the pageflipping warning, but something else is obviously wrong, and the matlab console must show new warnings...
I changed the VTOTAL parameter to the real height, i.e. 800 in my display resolution. Then I call Screen('Preference', 'VBLEndlineOverride', VTOTAL); It solves...
leannelaychan
leannelaychan@...
1:38 am
10272
Leanne, do a test run (without changing VTOTAL) and just post the full Matlab output here. And if you run PerceptualVBLSynctest(screenid) with screenid being...
Hello, I would like to move the drift grating (from DriftDemo), using the cursor coordinate as the eccentricity of the draft grating pattern. What functions I...
Having problems with message search?
Fill out this form to ensure your group is one of the first to be migrated to the new message search system.
