Presenting an image stimulus that won't flicker between window flips

Coding
1

Hi,
I want to present an image stimulus for 250 ms that won’t flicker as I present two different letters, each for 100 ms and a 50 ms blank period between. However, I cannot stop the image from disapperaring or flickering as the letters change. Can anyone help me with this?

while trial_window.getTime()<=0.250:
img_list_draw[1].draw()
target_letter_list[2].draw()
win.flip()
psychopy.core.wait(0.100)

    win.flip()
    psychopy.core.wait(0.050)
    win.flip()
    target_letter_list[3].draw()
    win.flip()
    psychopy.core.wait(0.100)

My code looks like this and as you can guess, the image stays on for only 100 ms instead of 250.

2

Don’t win.flip() after core.wait.

Draw flip wait draw flip wait

4

Thank you! It works now.