How to access trial number of routine (or, how to create catch trials within routine)

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Hello ah5005

is the code you posted above the code you used in your experiment?

onesArray[:25] == 0
onesArray[51:100] == 1

I think the code does not what you want it to do, at least as I understand it. In PsychoPy you would write something such as

onesArray = []
for i in range(100):
    if i < 25:
        onesArray.append(0)
    else:
        onesArray.append(1)

shuffle(onesArray)

to fill the array(list) in a Begin Experiment tab.

Then in the Begin Routine tab:

checkCatch = onesArray.pop()

if checkCatch == 1:
    contrastVal  = level
else: 
    contrastVal = 0

BTW, if you follow Becca’s advice and put the 0s and 1s in an Excel-file, loop over this file and set it to randomize, you’ll get a unique randomized order each time the loop is called.

Best wishes Jens

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