Randomization of Lists with Sequential Trials

[David McFarlane]

David,

I hope someone smarter than me will weigh in, I feel that a solution 
exists but I
am still having trouble following this.  Could you give an even more 
concrete example, maybe simplified to 3 Lists with 3 trials each, 
with actual stimulus items, etc., showing first what you might like 
one complete run of this hypothetical sequence of 9 trials total to 
look like, and then one run of what might really happen under your 
current setup?

Thanks,
-- David McFarlane


At 5/8/2014 10:59 AM Thursday, David Ruvolo wrote:
>There was a thread on this topic a while ago, but it appears there 
>wasn't an update if the suggests worked or if the issue was resolved.
>
>I am working on building an experiment that has several lists, where 
>each list has the same number of trials. The order of the lists do 
>not matter, but the trials do. The order of the lists should be 
>randomized (list 4, list2, list8,list1, etc.) and the trials must be 
>presented in sequential order. The reason is the stimuli presented 
>in subsequent trials depend on the response of the first trial.
>
>I have the main task proc set to random and each list set to 
>sequential. I have each list nested under a main procedure list and 
>the order set to random. As of now, when the task is run everything 
>is randomized (pure chaos!).
>
># It looks like 
>this:                                               #  It should look like this
># Current: (random everything)                          # Ideal: 
>(random lists, sequential trials)
>      List 8, trial 
> x                                                          List 8, trial 1
>      List 1, trial 
> x                                                          List 8, trial 2
>      List 3, trial x 
> ...                                                      List 8, trial 3
>      ... 
>                ...
>      ... 
>                List 2, trial 1
>      ... 
>                List 2, trial 2
>      ... 
>               ...
>
>I am not sure where the issue lies.  The structure of the experiment 
>can be found below.  Any information or suggestions with this issue 
>would be greatly appreciated.
>
>- David
>
># 
>------------------------------------------------------------------------------------------------------------
>
># Experiment structure
>- main
>      - [initial parameters, instructions, etc.]
>      - practice
>      - taskproc #each list is nested in the main taskproc and order 
> set to random
>             - list1
>             - list2
>             - list3
>             - list4
>             - list5
>             - list6
>             - list7
>             - ...
>
># List structure
>- main
>      - [initial parameters, instructions, etc.]
>      - practice
>      - taskprocedure
>             - list1
>                   - Trial 1
>                   - Trial 2
>                   - Trial 3
>                   - Trial 4
>                   - ...
>             - list2
>                   - Trial 1
>                   - Trial 2
>                   - Trial 3
>                   - Trial 4
>                   - ...

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