Text box/polygon response - change options between subjects

[wakecarter]

Here is the basic code (Begin Experiment)

positions = [[-.4,.4],[.4,.4]]
if int(expInfo['participant']) % 2 == 1:
     positions = [[.4,.4],[-.4,.4]]

Then use positions[0] for the position of one option and positions[1] for the other.

This will allocate the positions based on whether the participant number is odd or even.

This will be random. If you want the same number in both groups you need counterbalancing,

Wakefield's Daily Tips

Random vs Counterbalanced There are three main levels of randomisation that typically exist within an experiment. Random order of trials Random order of conditions Random assignment to groups Order of trials is set either by setting the loop to sequential, random or fullRandom. When the loop is sequential, then the trials themselves could be an a specific order (e.g. of increasing difficulty), a pre-randomised order or a shuffled order of selected rows. Having a random order has the advantage…