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from psychopy import visual, core, event #import some libraries from PsychoPy
#create a window
mywin = visual.Window([800,600],monitor="testMonitor", units="deg")
#create some stimuli
grating = visual.PatchStim(win=mywin, mask='circle', size=3, pos=[-4,0], sf=3)
fixation = visual.PatchStim(win=mywin, size=0.2, pos=[0,0], sf=0, rgb=-1)
#draw the stimuli and update the window
while True: #this creates a never-ending loop
grating.setPhase(0.05, '+')#advance phase by 0.05 of a cycle
grating.draw()
fixation.draw()
mywin.flip()
if len(event.getKeys())>0: break
event.clearEvents()
#cleanup
mywin.close()
core.quit()
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