Selecting from different lists depending on trial name

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Selecting from different lists depending on trial name

Selecting from different lists depending on trial name

Author	Message
drivas	drivas posted 11 Years Ago Topic Details Share Topic
Group: Forum Members Posts: 9, Visits: 49	Hi! I am looking for a way to make a picture element select from a different list depending on a trial name. For example I have two lists: <list A> /items= (2, 5, 8, 1) </list> <list B> / items = (3, 6, 4, 10) </list> And my picture element looks like this: <picture stim> /items = mypictures /select = <% list.listA.nextvalue %> </picture> Would there be a way to dynamically change the "select" mode to <%list.listB.nextvalue%> with an /ontrialbegin clause? Is there another way? I could always hard code them but since my pictures can be either on the left or on the right, from category X or Y, and finally from pool A or B of a category, this would yield 2^3 picture elements with basically the same code which just seems like very bad programming to me.
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Dave	Dave posted 11 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 108K	Sure. You simply do <values> / myvalue = 1 </values> <picture stim> /items = mypictures /select = values.myvalue </picture> <trial Atrial> / ontrialbegin = [values.myvalue=list.A.nextvalue] ... </trial> <trial Btrial> / ontrialbegin = [values.myvalue=list.B.nextvalue] ... </trial>
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drivas	drivas posted 11 Years Ago ANSWER Post Details Share Post
Group: Forum Members Posts: 9, Visits: 49	Wow. Thanks again for the fast reply!
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drivas	drivas posted 11 Years Ago ANSWER Post Details Share Post
Group: Forum Members Posts: 9, Visits: 49	I just realized something with my script. In fact, during the trial (which is actually a surveypage), I display two stimuli simultaneously and ask the subject to rate the similarity using a slider. This means that during a trial, I must fetch two picture elements, and thus using a value would make my script simply select the same image again. <surveypage page> /stimulustimes= [0=pictureLeft, pictureRight] ... </surveypage> <picture pictureLeft> /items= mypictures /select = values.myvalue ... </picture> <picture pictureRight> /items= mypictures /select = values.myvalue ... </picture> I would like my script to select the next value in the list after list.listA(or B).nextvalue.
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Dave	Dave posted 11 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 108K	You need to set the <list>s' /selectionrate appropriately, i.e. to 'always'. See the documentation for said attribute for details. In addition, you need two <values> entries. One for the left pic, another for the right. Populate them from the <list> /ontrialbegin as needed. Edited 11 Years Ago by Dave
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