I am currently running an experiment in which a fixation point is presented for 500ms, followed by a visual stimulus, followed by a mask. My stimulus files are drawn such that the fixation point always stays on the screen, so my stimulus files are as follows:
- Fixation point alone, 500ms
- Fixation + Visual stimulus, 200ms
- Fixation + Mask, 200ms
When I present them in sequence, the fixation point, rather than appearing a constant, solid, point on the screen flashes or “flickers” with each new file presentation. I figure that this has to do with the fact that SuperLab has to draw each stimulus separately, but I have run experiments on older versions of SL that are nearly identical and I have not had this problem. I have also tried adjusting the memory so that SuperLab loads all files at the beginning of the experiment, and that doesnt seem to work either. Any ideas?