Randomization of Lists with Sequential Trials
David Ruvolo
davidruvolo51 at gmail.com
Thu May 8 18:46:52 UTC 2014
Thanks for your help. I have provided more information about the task.
See the attached pdf for more information about the list structure.
This is quite a poor example, but hopefully the idea is there.
Now for the randomization part. When the erun file is loaded and the
instructions/practice are through, I would like the task to randomize the
order of the lists. So using the same example as before, let's say the
first list administered is list 2 and all the trials within this list are
administered. The second list administered is list 1 and all the trials
within this list are administered. Then to list 3 and so forth. However,
that is not what happens. See below for where I am at now. I am using the
same example. The total number of trials is 15 (3 lists, 5 trials per
list).
The task correctly displays the stimuli and keeps track of the adjusted
value (left stimuli), but the blocks are varied. Interestingly the trials
are administered in order but not one after another (Oops, I think I left
this part out in my first post).
Here is how the actual task runs:
# Trial 1
Left Stimuli = 1 ; Right stimuli = 2; Response= "yes" Then multiply the
left stimuli by the value the reaction: 2 x 2 = 4
# Trial 2
Left Stimuli = 1 ; Right stimuli = 3; Response= "yes" Then multiply the
left stimuli by the value the reaction: 2 x 2 = 4
# Trial 3
Left Stimuli = 1 ; Right stimuli = 1; Response= "yes" Then multiply the
left stimuli by the value the reaction: 2 x 2 = 4
# Trial 4
Left Stimuli = 4 ; Right stimuli = 3; Response= "yes" Then multiply the
left stimuli by the value the reaction: 4 x 8 = 32
# Trial 5
Left Stimuli = 4 ; Right stimuli = 2; Response= "yes" Then multiply the
left stimuli by the value the reaction: 4 x 8 = 32
# Trial 6
Left Stimuli = 32 ; Right stimuli = 3; Response= "yes" Then multiply the
left stimuli by the value the reaction: 32 ^ 14 = a long number
.... # and so forth
I have tried choosing the Order in the list properties and varying the
Reset/Exit options. The sequential option addresses fixes the one after
another issue, but not the randomization of the blocks issue. The
randomization option displays the lists randomly and the trials are not one
after another. I have a feeling this is a simply fix. I am not sure if it
an experiment structure issue, a missing presentation option, or I need to
add another in-line script to control the order (which might be the best
option). I wanted to see if anyone had experience with a task structure
like this and what they have done in the past to address this issue.
Hopefully this has made the task and the issue a little clearer.
Thanks for your help,
- David
On Thursday, May 8, 2014 10:47:38 AM UTC-5, McFarlane, David wrote:
> David,
>
> I hope someone smarter than me will weigh in, I feel that a solution
> exists but I
> am still having trouble following this. Could you give an even more
> concrete example, maybe simplified to 3 Lists with 3 trials each,
> with actual stimulus items, etc., showing first what you might like
> one complete run of this hypothetical sequence of 9 trials total to
> look like, and then one run of what might really happen under your
> current setup?
>
> Thanks,
> -- David McFarlane
>
>
> At 5/8/2014 10:59 AM Thursday, David Ruvolo wrote:
> >There was a thread on this topic a while ago, but it appears there
> >wasn't an update if the suggests worked or if the issue was resolved.
> >
> >I am working on building an experiment that has several lists, where
> >each list has the same number of trials. The order of the lists do
> >not matter, but the trials do. The order of the lists should be
> >randomized (list 4, list2, list8,list1, etc.) and the trials must be
> >presented in sequential order. The reason is the stimuli presented
> >in subsequent trials depend on the response of the first trial.
> >
> >I have the main task proc set to random and each list set to
> >sequential. I have each list nested under a main procedure list and
> >the order set to random. As of now, when the task is run everything
> >is randomized (pure chaos!).
> >
> ># It looks like
> >this: # It should look
> like this
> ># Current: (random everything) # Ideal:
> >(random lists, sequential trials)
> > List 8, trial
> > x List 8, trial
> 1
> > List 1, trial
> > x List 8, trial
> 2
> > List 3, trial x
> > ... List 8, trial 3
> > ...
> > ...
> > ...
> > List 2, trial 1
> > ...
> > List 2, trial 2
> > ...
> > ...
> >
> >I am not sure where the issue lies. The structure of the experiment
> >can be found below. Any information or suggestions with this issue
> >would be greatly appreciated.
> >
> >- David
> >
> >#
> >------------------------------------------------------------------------------------------------------------
>
> >
> ># Experiment structure
> >- main
> > - [initial parameters, instructions, etc.]
> > - practice
> > - taskproc #each list is nested in the main taskproc and order
> > set to random
> > - list1
> > - list2
> > - list3
> > - list4
> > - list5
> > - list6
> > - list7
> > - ...
> >
> ># List structure
> >- main
> > - [initial parameters, instructions, etc.]
> > - practice
> > - taskprocedure
> > - list1
> > - Trial 1
> > - Trial 2
> > - Trial 3
> > - Trial 4
> > - ...
> > - list2
> > - Trial 1
> > - Trial 2
> > - Trial 3
> > - Trial 4
> > - ...
>
>
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