issue with multiple levels of nested lists

[liwenna]

Hi Erin,

Not entirely sure if I understood your description correctly but could
it be that you try to pull two levels from the same list (at the third/
lowest) level on each trial i.e. fill the first level of the middle
list with the items in the first and the second level of the
thirdlevel list?  If so: that will not work. On each trial only one
level of each list can be used.

Assuming that you need two stims of the same type at each trial: Is it
an option for you to divide each set of stims for each 'type' into two
halve sets? In that case you could put each stim from one halve set
into it's own level at the middle level (or top level even) and nest
into that level a list with the other halve set of the same stimtype.
In this set-up two items that are in one list (the 'master' or the
nested list) will never be paired, but random combinations would be
generated between the two halve sets of each stimtype. Alternatively
(in order to achieve fully randomized combinations within each type of
stimuli) I personally would use a set-up that uses a bunch of code to
first randomize the stimuli and then write combinations of items into
the list. I'd expand on that but rather first know if that would help
you out.

Best,

liw

On Sep 20, 11:04 am, Erin <erinjoneshigg... at gmail.com> wrote:
> I am having some trouble figuring out the best way to do the
> following:
>
> I have an experiment that is using 3 levels of lists. At the highest
> level, the list calls on a middle level list in order to fill 2
> different stimulus presentations (e.g. [stim:0] and [stim:1] ). At the
> middle level, there are 9 types of items which can fill the "stim"
> slot, each corresponding to a different nested list (which has the
> actual items to be used). When I run the experiment, the program will
> choose two items at the middle level, but it gets stuck in the first
> item's nested list (so I get an error when it tries to pull the second
> stimulus saying that it is out of context). Any ideas how to get E-
> prime to pull both nested lists at the same time?  Also I know that if
> I put all of the lowest level lists into the nested column for the
> highest level list, it will work. The issue with that though is that
> it will then over-sample the lowest level lists, causing me to lose
> control of the number of presentations of each specific item.
> Hopefully this is clear enough - let me know if you need more details.
> Thanks!

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