Randomization of Lists with Sequential Trials
David Ruvolo
davidruvolo51 at gmail.com
Thu May 29 21:49:57 UTC 2014
Hi Sally,
Thanks for your help, but I figured out where the error occurred. There
was an error in my in-line scripts, since the stimulus for each trial is
dependent on the previous response.
Thanks,
David
On Thursday, May 29, 2014 9:51:47 AM UTC-5, sally wrote:
>
> Hi, Ruvolo. I think David has already answered your question clearly.
> It's not that difficult and nested list can help you achieve this. I may
> try to make an example for you tomorrow morning if it's useful to you.
>
> My best,
>
> Sally
>
> 发自我的 iPhone
>
> 在 2014年5月9日，上午2:46，David Ruvolo <davidr... at gmail.com <javascript:>> 写道：
>
> 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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> <example.list.str.pdf>
>
> <example.list.task.pdf>
>
>
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