Randomized selection of stimuli across trials

[Paul Groot]

Hi Halle,

You probably would like to use a separate Word list and include it as
nested list in your TrialList. Then add 3 separate attributes in the
trial list (Word1, Word2, Word3). The values of these attributes are
resp. [Word:0], [Word:1], [Word:2] (all trials the same). These will
pull 3 random words from the nested Word list and copy the values to
the attributes: Word1, Word2, Word3. Then use these 3 attributes in
your display objects as usual (i.e. resp [Word1], [Word2], [Word3]).
That should do it...

The attached EPrime 1.2 example demonstrates this mechanism. (You can
also import this script in EPrime 2)

Best,
Paul

2011/8/4 HalleZ <zhallez at gmail.com>:
> Hello,
>
> I am trying to program an experiment where I have three different
> words presented on each trial. I would like ePrime to uniquely select,
> without replacement across trials in a single session, the three words
> that get combined into a single trial so that this triplet is unique
> for each person. Currently, I have a separate text object in my
> TrialProcedure for each word (Word1, Word 2, Word3) with each of these
> text objects pulling from the same list ("Words") of all of my words
> (so, on each text object it pulls the attribute [Word] from the
> "Words" list). In my list object called "Words" where all of my
> stimuli are listed, I have the properties set so that the selection
> method is "random" (i.e., without replacement). However, ePrime pulls
> the same words within a trial (so, people might see "cat", "dog",
> "cat" but what I want them to see is three unique words like "cat",
> "dog", "bunny"). What did I do wrong? Is this property of no
> replacement only applied across trials?
>
> Thanks for the help!
>
> -Halle
>
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