If this template helps then use it. If not then just delete and start from scratch.
OS (e.g. Win10):
PsychoPy version (e.g. 1.85.1):
I am trying to implement an attention bias measurement task. Firstly i have to display a cross image. Secondly, i have to present two face images (one angry and one neutral), side by side. Thirdly, i have to display the cross image again, only that the cross image has to appear in 50% of the trials in the place of the neutral face and in 50% of the trials in the place of the angry face. I have 16 face pairs and i run the set 4 times, for a total of 64 iterations.
I have the experiment running in psychopy. However, i want the pairs of faces to be placed randomly (at the time i am writing this i only managed to display the angry faces on the left side and the neutral faces on the right side). How would i go about in builder or the excel that contains the variables to randomize the placement of faces and condition the cross to appear 50% in the place of the angry face and 50% in the place of the neutral face?
My excel variable file is arranged as follows:
picture1-disgust.jpg (-0.5, 0) picture1-neutral.jpg (0, 0.5) probe.jpg (0.5, 0)
picture2-disgust.jpg (-0.5, 0) picture2-neutral.jpg (0, 0.5) probe.jpg (0.5, 0)
picture3-disgust.jpg (-0.5, 0) picture3-neutral.jpg (0, 0.5) probe.jpg (0.5, 0)
picture4-disgust.jpg (-0.5, 0) picture4-neutral.jpg (0, 0.5) probe.jpg (0.5, 0)