cannot see image stimuli using mlplayer trial-replay

Hi,

We showed our monkey some images in the screen while tracking their eye position. But when we used mlplayer to replay the trials, it only showed the eye position, but not the images we showed.

The image files were in the same directory as other condition files. Ml build 193 on windows10; error "cannot assign empty matrix" line 325-326 in mlplayer.m. It seems a small issue, but could someone help us out please?

Thanks!
Haoran

Please download the package again. Sorry for the inconvenience.

Thank you for the reply!
We updated, now it's 199. We saw no errors in matlab, but still replay didn't show any images, and there is just eye position.
What's next?

Show me your task and the data file please. I am out of the office for the rest of the week though.

Thanks! please see attached.

If you manipulate stimuli directly with their MGL object IDs, NIMH ML does not get a chance to collect necessary information and the resulting datafile cannot be replayed. Some adapters accept MGL object IDs, but it is for rare cases that require special control even though replayability is sacrificed. Usually you are not supposed to use MGL object IDs when writing timing scripts.

To use TaskObjects in the scene framework, provide them as input arguments of create_scene.
https://monkeylogic.nimh.nih.gov/docs_RuntimeFunctions.html#create_scene

So your code can be rewritten like the following.

images = 2;  % TaskObject#2
reposition_object(images,[randi([-20 20]) randi([-8 8])]);
fc = TimeCounter(null_);
fc.Duration = 1000;
scene1 = create_scene(fc,images);