Random group stimulis??

Comments

• eduard

  August 2017

  Hey,

  There are a lot of ways to do that. Below just one example.

  1) Put an inline_script in the beginning of your experiment and paste following code in the preparephase

  # make a list with a 5 groups (basenames are enough)
  items = ['CocaCola','NescafeClassic','Fanta','Pepsi','Nutella']
  
  # use participant ID to select the group
  # "%" (modulo) returns the rest of a division,e.g. 1%2 = 1, 2%2=0,3%2 =1, 4%2=2,etc...
  
  groupID = var.subject_nr%5 # if you have 5 groups
  
  # define the order for each group
  if groupID == 0:
      orderedItems = items
  elif groupID ==1:
      orderedItems = items[1:]+ items[0]
  elif groupID ==2:
      orderedItems = items[2:]+ items[:2]
  elif groupID ==3:
      orderedItems = items[3:]+ items[:3]
  elif groupID ==4:
      orderedItems = items[4:]+ items[:4]
  
  # add the endings of each picture
  var.complete_list = []
  for o in orderedItems:
      var.complete_list.append(o+'_1.png')
      var.complete_list.append(o+'_2.png')
      var.complete_list.append(o+'_3.png')
  
  # var.complete_list will now have all the 15 trials in it. 
  
  

  Hope this helps.

  Eduard

  
• koerdemir

  August 2017

  Thank you so much Eduard