Need help for experiment for display randomly narratives across participant

Comments

• fladd

  November 2016

  Dear oriane_g26,

  If I understand you correctly, I would suggest to create 12 different trials and assign each trial a factor "ending", with 4 levels (http://docs.expyriment.org/expyriment.design.Trial.html#expyriment.design.Trial.set_factor). You can then create a corresponding between subject factor (http://docs.expyriment.org/expyriment.design.Experiment.html#expyriment.design.Experiment.add_bws_factor), and use get_permuted_bws_factor_condition() (http://docs.expyriment.org/expyriment.design.Experiment.html#expyriment.design.Experiment.get_permuted_bws_factor_condition) to get the corresponding ending for each participant (assuming you want the same ending for all 12 narratives per participant). This balances the endings over participants.

  To then present the 12 trials randomly, just shuffle the block you put them in (http://docs.expyriment.org/expyriment.design.Block.html#expyriment.design.Block.shuffle_trials).

  Something like this maybe (not tested!):

  import expyriment as xpy
  
  narratives = [{"beginning":"narrative1", "possible_endings": ["ending1", "ending2", "ending3", "ending4"]},
                {"beginning":"narrative2", "possible_endings": ["ending1", "ending2", "ending3", "ending4"]},
                {"beginning":"narrative3", "possible_endings": ["ending1", "ending2", "ending3", "ending4"]},
                {"beginning":"narrative4", "possible_endings": ["ending1", "ending2", "ending3", "ending4"]},
                {"beginning":"narrative5", "possible_endings": ["ending1", "ending2", "ending3", "ending4"]},
                {"beginning":"narrative6", "possible_endings": ["ending1", "ending2", "ending3", "ending4"]},
                {"beginning":"narrative7", "possible_endings": ["ending1", "ending2", "ending3", "ending4"]},
                {"beginning":"narrative8", "possible_endings": ["ending1", "ending2", "ending3", "ending4"]},
                {"beginning":"narrative9", "possible_endings": ["ending1", "ending2", "ending3", "ending4"]},
                {"beginning":"narrative10", "possible_endings": ["ending1", "ending2", "ending3", "ending4"]},
                {"beginning":"narrative11", "possible_endings": ["ending1", "ending2", "ending3", "ending4"]},
                {"beginning":"narrative12", "possible_endings": ["ending1", "ending2", "ending3", "ending4"]}]  # Replace with actual narratives and endings
  
  exp = xpy.control.initialize()
  block1 = xpy.design.Block()
  for counter, narrative in enumerate(narratives):
      trial = xpy.design.Trial()
      trial.set_factor("Narrative", counter+1)
      s = xpy.stimuli.TextBox(narrative["beginning"])
      trial.add_stimulus(s)
      trial.possible_endings = narrative["possible_endings"]
      block1.add_trial(trial)
  block1.shuffle_trials()
  exp.add_block(block1)
  exp.add_bws_factor("Ending", [1, 2, 3, 4])
  exp.add_data_variable_names(["Narrative", "Ending"])
  xpy.control.start()  # This will create a subject ID
  
  for trial in exp.blocks[0].trials:
      ending = exp.get_permuted_bws_factor_condition("Ending")
      trial.set_factor("Ending", ending)
      s = xpy.stimuli.TextBox(possible_endings[ending-1])
      trial.add_stimulus(s)
  
      for stimulus in trial.stimuli:
          s.present()
          exp.keyboard.wait()
  
      exp.data.add([trial.get_factor("Narrative"), trial.get_factor("Ending")])
  
  xpy.control.end()
  

  I hope this helps, let me know if you have any further questions.

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• oriane_g26

  November 2016

  this helps !Thank you very much !
  i have one more question, for narratives can i import stories from a folder or do i write them directly on the script ?
• oriane_g26

  November 2016

  maybe this could be efficient...
• fladd

  November 2016

  I just put them into my example directly in order to demonstrate the principle, but you can of course also read them from a text file.

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• oriane_g26

  November 2016

  Ok, thanks !
  for the selection of the type of ending i need something like random.choice() because the number of each ending correspond to a specific condition (ending1 = condition1, ending 2= condition..) but across stories participant mustn't read only one type of condition.
  I've try to change this by replace s = xpy.stimuli.TextBox(possible_endings[ending-1]) by s = xpy.stimuli.TextBox(random.choice(possible_endings)) but in data i don't have the correct index associate with the type of ending presented