Random position stimuli outside edges of screen

Builder
1

OS (e.g. Win10):
macOS Ventura13.0

PsychoPy version (e.g. 1.84.x):
PsychoPy v2022.2.4

Hello everyone.

I am making a visual search task consisting of 1 target and 50 distractors. I have set the target and distractors to be in a new random position for every repeat. Like this:
pos:(random()-0.5, random()-0.5)

The problem is that the stimuli sometimes show up slightly outside the edges of the screen when I run the experiment.

I tried to change the spatial units of the stimuli and change the screen width in the monitor center just to see, but I can’t seem to solve this.

Does anyone know how to prevent this from happening? Thank you so much.

2

Are you using height units? If so, then I would only expect your items to go off the top and bottom of a landscape screen. The issue, I think, is that you are forgetting the size of the object itself. Something positioned at (0,.5) will be half off the top of the screen.

3

Great. Changing units from height to norm fixed the problem. Thank you so much for your help