Randomize pair of stimuli between subject but maintain same pair within subject

Comments

• DahmSF

  May 2023

  Hi Irene,

  i am not sure whether i really got what you are looking for, but from your description, it appears like you only need to define 2 variables in your loop (one for image, one for value).

  This may looks something like that:

  image value

  cheese low

  cheese high

  wash low

  wash high

  
  

  Hope that helps
• ireneruizp

  May 2023

  Thanks for your answer. Yes, but I need to take ten randomize rows of cheeses and ten randomize rows of washes for each participant, but the pairs 'stimulus-value' must maintain the same for the participant. If I just create two columns and randomize pairs one participant would see, for example, 'cheese 1-low' in one trial but 'cheese 1-high' in another trial. I hope I explained my self.
• DahmSF

  May 2023

  Hi Irene,

  if I got it right, then you will need a third variable that includes the numbers from 1 to 10 as there are ten difference cheeses. Actually, OpenSesame can make the multiplication to 40 rows then!

  A second thing you mentioned is the order of the stimulus appearance, right? If you want the same order of stimuli for each participants, you should not use 'random' but 'sequence'. Just create your own sequence in the rows that will be equal for all participants.

  Saludos

  Stephan