OS (e.g. Win10): Win 10
PsychoPy version (e.g. 1.84.x): 3.1.5
Standard Standalone? (y/n) If not then what?: y
What are you trying to achieve?:
I am trying to make a flashing dots appear over a movie at 7.5Hz. Importantly I need the 100 dots to be synchronized such that they disappear and reappear at the same time. The dots also need to be in a new location when they reappear. This is to elicit and steady state visually evoked potential for EEG. A simplified example can be seen below.
What did you try to make it work?:
I’ve used the RDK stimulus in builder with 0 direction and a speed of 0.
What specifically went wrong when you tried that?:
I can get the flashing effect by making multiple RDK elements (see image below) but I would need to add about 38 dot stimuli because that would be equal to 7.5Hz over a 5 second movie. This would obviously be time consuming and may also slow down the presentation. I could eventually code something more efficient, but I don’t want to lose all the useful timing elements that come with the builder version. Does anyone have any advice for this problem?
Thank you so much,