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Group: Administrators
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Visits: 109K
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Start with something like this
<block myblock>
/ trials = [1-6=sequence(trial1, trial2, trial3)]
</block>
*** select category, display 1st stimulus ***
<trial trial1>
/ ontrialbegin = [values.t01hpos=50%]
/ ontrialbegin = [if(list.categorylist.unselectedcount>0) {values.selectedcategory=list.categorylist.nextvalue;
list.categoryrepeatlist.appenditem(values.selectedcategory); }
else values.selectedcategory=list.categoryrepeatlist.nextvalue]
/ ontrialbegin = [if (values.selectedcategory==1) {
values.t01item=list.cat1itemlist.nextvalue;
values.t02item=list.cat1itemlist.nextvalue;
values.t03item=list.cat1itemlist.nextvalue;
}]
/ ontrialbegin = [if (values.selectedcategory==2) {
values.t01item=list.cat2itemlist.nextvalue;
values.t02item=list.cat2itemlist.nextvalue;
values.t03item=list.cat2itemlist.nextvalue;
}]
/ ontrialbegin = [if (values.selectedcategory==3) {
values.t01item=list.cat3itemlist.nextvalue;
values.t02item=list.cat3itemlist.nextvalue;
values.t03item=list.cat3itemlist.nextvalue;
}]
/ stimulusframes = [1=t01]
/ validresponse = (57)
</trial>
*** display 1st and 2nd stimulus ***
<trial trial2>
/ ontrialbegin = [values.t01hpos=list.2poslist.nextvalue;
values.t02hpos=list.2poslist.nextvalue; ]
/ stimulusframes = [1=t01, t02]
/ validresponse = (57)
</trial>
*** display 1st, 2nd and 3rd stimulus ***
<trial trial3>
/ ontrialbegin = [values.t01hpos=list.3poslist.nextvalue;
values.t02hpos=list.3poslist.nextvalue;
values.t03hpos=list.3poslist.nextvalue; ]
/ stimulusframes = [1=t01, t02, t03]
/ validresponse = (57)
</trial>
*** Some global variables for currently selected category, selected items and positions ***
<values>
/ selectedcategory = 0
/ t01item = 1
/ t02item = 1
/ t03item = 1
/ t01hpos = 50%
/ t02hpos = 50%
/ t03hpos = 50%
</values>
*** 3 categories / selected at random ***
<list categorylist>
/ items = (1,2,3)
</list>
*** store initial random order of categories for later repetition ***
<list categoryrepeatlist>
/ selectionmode = sequence
</list>
*** item numbers for 6 items in category 1 ***
<list cat1itemlist>
/ items = (1,2,3,4,5,6)
/ selectionrate = always
</list>
*** item numbers for 6 items in category 2 ***
<list cat2itemlist>
/ items = (7,8,9,10,11,12)
/ selectionrate = always
</list>
*** item numbers for 6 items in category 3 ***
<list cat3itemlist>
/ items = (13,14,15,16,17,18)
/ selectionrate = always
</list>
*** random left / right position ***
<list 2poslist>
/ items = (40%, 60%)
/ selectionrate = always
</list>
*** random left / middle / right position ***
<list 3poslist>
/ items = (30%, 50%, 70%)
/ selectionrate = always
</list>
<text t01>
/ items = myitems
/ select = values.t01item
/ hposition = values.t01hpos
</text>
<text t02>
/ items = myitems
/ select = values.t02item
/ hposition = values.t02hpos
</text>
<text t03>
/ items = myitems
/ select = values.t03item
/ hposition = values.t03hpos
</text>
<item myitems>
/ 1 = "Category 1 Item 1"
/ 2 = "Category 1 Item 2"
/ 3 = "Category 1 Item 3"
/ 4 = "Category 1 Item 4"
/ 5 = "Category 1 Item 5"
/ 6 = "Category 1 Item 6"
/ 7 = "Category 2 Item 1"
/ 8 = "Category 2 Item 2"
/ 9 = "Category 2 Item 3"
/ 10 = "Category 2 Item 4"
/ 11 = "Category 2 Item 5"
/ 12 = "Category 2 Item 6"
/ 13 = "Category 3 Item 1"
/ 14 = "Category 3 Item 2"
/ 15 = "Category 3 Item 3"
/ 16 = "Category 3 Item 4"
/ 17 = "Category 3 Item 5"
/ 18 = "Category 3 Item 6"
</item>
and build / extend from there. I would recommend (1) working through the tutorials and the how-to section in the documentation for the basics, (2) study the topics on conditional logic, functions, operators, <values> and <expressions>, (3) familiarize yourself with <list> elements, their properties and functions via the applicable language reference topics.
In addition, perhaps pick out a couple of scripts from the task / test library to study to see the things mentioned above in practical use.
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