Randomize image position

Comments

• fladd

  June 2020

  Hi,

  
  

  you could do something like

  import itertools
  
  all_combinations = list(itertools.permutations([position1, position2, position3]))
  
  block = expyriment.design.Block()
  for combination in combinations:
      trial = expyriment.design.Trial()
      happy = stimuli.Picture("images\happy.png", position=combination[0])
      sad = stimuli.Picture("images\sad.png", position=combination[1])
      angry = stimuli.Picture("images\angry.png", position=combination[2])
      trial.add_stimulus(happy)
      trial.add_stimulus(sad)
      trial.add_stimulus(angry)
      block.add_trial(trial)
  
  exp.add_block(block)
  
  
  

  and then loop over this structure

  for block in exp.blocks:
      for trial in block.trials:
          expyriment.stimuli.FixCross().present()
          exp.clock.wait(1000 - trial.preload_stimuli()
          trial.stimuli[0].present(update=False)
          trial.stimuli[1].present(clear=False, update=False)
          trial.stimuli[2].present(clear=False)
          exp.clock.wait(2000)
  

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• JJJ

  June 2020

  Hi,

  exactly what I was looking for! Thanks for the help!
• fladd

  June 2020

  Glad I could help!

  Warning There was an error rendering this rich post.
• JJJ

  June 2020

  Sorry for coming back to this, but in this way I cannot find a way to return the option chosen.

  For example after generating a random location of the images

  all_combinations = list(itertools.permutations([position1, position2, position3]))
  random.shuffle(all_combinations)
  

  then the images on the screen will be presented like this:

  [angry] [sad] [happy]

  and the participant chooses the [angry] face

  I can only report back on expyriment output the 'left' key that is pressed, the reaction time or the position of the image that was chosen, but not which image. In that case the position will be (-250,0). But for me this is not valuable information because it is not 'paired' with the angry face.

  I would really appreciate if you know a way to resolve this! Thanks :)