Ramdomization Issues

[klgreen]

I don't think so. I have 4 files of stimulus lists that I'm calling from for one block (target1, target2, adject1, adject2). There are 5 stimulus words in each of those lists. I would like to do 30 random trials but that alternate between listing one of the target words and one of the adjective words.

For example, the way the stimuli are listed in the example IAT are:
target1
adject1
target1
adject1
target2
adject2
target2
adject2

So basically, what I want to set up is exactly like the sample IAT, except that each stimulus file has 5 words instead of 4 and I want to have 30 random trials instead of 8. So the set-up of the sample IAT produces the effect I want, but because they are only calling for 8 trials, the 4 categories of stimulus equally divide between the trials so that each stimulus list is called on 2 times.

With my setup of 30 trials this does not work to list them this way because if I just list 30 trials some lists would have to necessarily be used more than others. I thought that one potential fix could be to list 40 trials, but put a skip after the 30th trial to go to the next block (that way they’re evenly divided, but still random). However, I read in the manual that to do this, the trial on which you want to place the skip (so for me, trial 30) would have to be fixed. Is there any way to have all 30 trials random instead of having to fix one of them in place? Or is there another method besides skipping that would set up my block this way?