How to have no repetitions in trial sequence by using the loop?

IngaSvea

Hello!

I want to create a go/no-go dual task in which the no-go condition comes only in 30% of trials. With the loop, I created a factorial design to my needs. But now my problem is, that I don't want to no-go trials (30% of trials) if the previous was already a no-go.

Is there any possiblity to access the loop to check for this?

Thanks in advance.

eduard

Hi Inga,

I am not sure whether advanced loop operations could also do the trick, but I would opt for an inline_script that takes care of the creation of the trial_sequence. For example following script:

import random
# zero represents 70% go, 1 represents 30% nogo
all_trials = [0]*70 + [1]*30
while True:
    random.shuffle(all_trials)
    # variable that decides whether the while loop will be terminated or not
    break_loop = 1
    for idx in range(1,len(all_trials)-1):
        # if the sum of two consecutive trials is 0, that means 2 nogos after each other
        if all_trials[idx]+all_trials[idx-1] == 0:
            break_loop = 0
     if break_loop:
         break

Does that help?

Eduard