Randomization question.

[biometricsassistant]

Thanks so much for getting back to us! Your information has been very
helpful, but I am still struggling with the exact sequence to set up
on EPrime. Bearing in mind that I am very new with this program (and
therefore pretty ignorant), I will try to give a more detailed
overview of my goal here. I am trying to set up an encoding task.
Essentially, there will be two levels that each subject is exposed to:
nonsemantic and semantic encoding. The order of these two tasks will
need to be randomized, so that some subjects will do the semantic task
first, and others will do the nonsemantic task first. For each of
these tasks, I want the program to select from a master list of 40
total words that is broken down into 5 lists of eight words each, each
list representing an individual semantic category (e.g., animal words,
furniture words, etc.). So, I would like the program to present 20
randomized words (four from each semantic category) to each subject
for each level (nonsemantic vs. semantic). What I continue to have
trouble with is how to translate that into the actual EPrime program.
Could you walk me through the specifics of how to set this up please?
I think that your suggestions for having nested list objects and an
overall Trial List are reasonable, but I am not sure how to fit the
random encoding procedure (semantic vs. nonsemantic task order) into
it. Please let me know if I can provide additional information. Thanks
so much for your help here!!

On Jan 2, 4:17 pm, Matt Lenhart <matt.lenh... at gmail.com> wrote:
> Hi Adam,
>
> There are a couple of ways you can do this. The easiest would be to
> use nested List objects. Essentially, you would create 5 List objects
> that each represent a category. You would then enter the 8 words for
> each category into their respective List. In your TrialList, you would
> have 5 levels. Each level would reference one of these Lists under its
> Nested column. Then, you would set the Weight column for each level to
> 4. At run-time, E-Prime will choose a stimulus from the specified
> nested List object. The TrialList will run 20 trials (4 trials from
> each of the 5 categories) and then exit. If the nested List objects
> are set to select randomly (but without replacement), all 40 words
> will be presented randomly and only 4 during each run of the TrialList
> (i.e. you could use the same TrialList for each phase of the
> experiment since it will run 20 trials each time).
>
> Please let me know if you have any questions.
>
> - Matt Lenhart
> PST Technical Consultanthttp://pstnet.com
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