[open] Randomization of trials between different blocks

Comments

• Josh

  September 2015 edited 11:50AM

  Hi Aviv,

  It depends on what parameters you have aside from 'priming type'. From your plan it seems that you want the possibility that something (aside from priming type) randomly occurs in one block but not in the other? (Otherwise you could've just copied the blocks and only change priming type in each of them).

  What you could do, is make just 1 block, with an amount of trials equal to the 3 blocks you had envisioned combined. Let's say there's 90 trials. What you would then do, is keep track of which trial you're at: place an inline_script before the block item, and insert the line:

   trial = 0   # creates a variable called 'trial'.
  

  In the inline_script in your block (sequence), you insert the line:

   trial += 1 # (trial increases 1 in value) 
  

  and lastly, indicate the priming_type variable - for instance:

   if trial < 31:
         priming_type = 'your_first_type'
   elif trial < 61:
         priming_type = 'your_second_type'
   else:
         priming_type = 'your_third_type'
  

  Does that help?

  Cheers,

  Josh