Randomly select from a list of stimuli but include breaks after a pre determined number of trials

[Heath Matheson]

Here is the solution, provided by friendly Alexandre Comte:

- In the Blocklist define 2 levels. The first one is for the TrialProc
(weight=20) and the second one for the BreakProc (weight=1).
- In the properties of Blocklist, set the number of cycles at 5, with a
sequential order.
- TrialList: random order
- finally insert your break in the TrialProc

Heath

On Wed, Oct 1, 2014 at 2:24 PM, Heath Matheson <heathericmatheson at gmail.com>
wrote:

> Hi all,
>
> I have an experiment in which I am showing 100 stimuli to participants and
> am recording object names. I would like to show 20 images, randomly
> selected from the 100, then have a break, then show another randomly
> selected 20 images, etc, until all 100 have been shown across 5 blocks with
> breaks in between them.
>
> My experiment looks like this:
>
> SessionProc
> ---Instructions
> ---Blocklist (with one level)
> -------Triallist (with a list of all 100 stimuli)
> -------TrialProc
> -------------Fixation
> -------------SlidePicture
> ---End
>
> So right now, I can show the 100 images randomly all the way through. I
> think to introduce breaks I need to play with nesting but everything I am
> doing doesn't work and seems overly complicated. The problem is easily
> solved if I don't worry about randomizing the presentation of all 100
> stimuli but this is an important part of the experiment.
>
> Any suggestions for how to include periodic breaks?
>
> Thanks!
>
> Heath
>
>
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-- 


*Heath E Matheson PhDPostdoctoral Fellow*
Center for Cognitive Neuroscience
University of Pennsylvania
3720 Walnut Street
Philadelphia, PA
19104-6241

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