Problems with randomizing nested lists by condition

Micah ucfmicah at gmail.com
Fri Sep 10 09:00:45 UTC 2010


Also, this setup seems terrible for logging purposes, as my logs look
like complete chaos, with only 4 rows and all of the onset times for
individual stimuli separated by multiple columns. I need a good
suggestion for a redesign.

On Sep 10, 10:58 am, Micah <ucfmi... at gmail.com> wrote:
> Hello,
>
> I am relatively new to E-prime programming, and have hit a roadblock
> in developing an fMRI paradigm. The paradigm I am trying to replicate
> is basically a passive trait-adjective viewing task. You can view the
> paper I'm getting the paradigm from here:
>
> http://scan.oxfordjournals.org/content/2/4/313.long
>
> Anyway, here are the essentials of the design:
>
> Participants are pre-trained in the distinction between narrative
> focus (NF) and experiential focus (EF). For the task, participants
> view a cue (either the word 'judge' or 'sense' with a corresponding
> picture below it) followed by 6 trait-adjectives. These adjectives are
> selected from 8 list of words, and it is important that the selection
> of each list is randomized by condition (judge or sense). The paradigm
> proceeds in 2 runs, with each condition running twice per run, and the
> lists should be also randomized between runs. This is where I have had
> problems- I can get the wordlists to be randomly selected via nested
> lists for each condition, but checking my logs I can see that some
> lists are being selected twice. Here is an attempted summary of my set
> up:
>
> SessionProc
> -Blocklist1
>  -BlockProc
>   -DesignList
>    -? [ListNumber:1]
>    -? [ListNumber:2]
>    -? [ListNumber:3]
>    -? [ListNumber:4]
>       -TrialProc
>        -Slide1
>        -Stimulus
>        -ISI
>        -Stimulus
>        -ISI
>        -Stimulus
>        -ISI
>        -Stimulus
>        -ISI
>        -Stimulus
>        -ISI
>        -Stimulus
>
> My BlockList is just a 4-row list with the vairable ListNumber and
> WordList1 through WordList4. I am using 8 nested lists for each
> individual 6-item word list. My design list uses nested lists
> [ListNumber:1-4], with variables for Condition, PrimeImage, PrimeText,
> and [Stim:1] through [Stim:6]. [Stim] is a variable in each of the
> wordlists and is used in each stimulus text display. I then repeat
> this entire structure for Run2, but with the BlockList listing
> WordLists 5-8.
>
> I hope this is at all clear. It is a relatively simply paradigm with
> no response task, but I cannot seem to get it to work right.

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