Display 3 stimuli on one page

Juliette

I am programming my cognitive task using expyriment. But I had some difficulty in representing 3 stimuli at the same time. In my task, there is a target word at the top of the page and beneath to that, there are two words ( 3 words as stimuli in one trial) that participant has to select between one of the two beneath words. using the code below I could not do that as it only represents stim 3. Could you please provide me a solution? apart from that, I have 120 of those trials ( each consist of 3 words), how can I load them as a list that automatically update at the orginal position?

Kind Regards

import expyriment

exp = expyriment.design.Experiment(name="First Experiment")
expyriment.control.initialize(exp)

stim1 = expyriment.stimuli.TextLine(text="Hello World", position=(300,0))
stim1.preload()
stim2 = expyriment.stimuli.TextLine(text="Hello World", position=(-300,0))
stim2.preload()
stim3 = expyriment.stimuli.TextLine(text="Hello World", position=(0,150))
stim3.preload()

expyriment.control.start()
stim1.present()
stim2.present()
stim1.present()

exp.clock.wait(1000)

expyriment.control.end()

fladd

Hi Juliette,

there are two ways to achieve what you want:

1. First create a transparent canvas to plot all three stimuli to, then present this canvas. This is most often the easiest solution
   canvas = expyriment.stimuli.Canvas(size=(500, 500)) # Adapt size to fit all three stimuli on it stim1.plot(canvas) stim2.plot(canvas) stim3.plot(canvas) canvas.present()
2. You can also present stimuli over what is currently on the screen, but you then need to take care of potential double buffering
   stim1.present(update=False) # needs to be called once per used video buffer stim2.present(clear=False, update=False) # needs to be called once per used video buffer stim3.present(clear=False) # needs to be called once per used video buffer

Let me know if you have any further questions.