Millisecond Forums

Re #1: That cannot happen *if* you run <block relation> only once. It can happen if you run it repeatedly in your full script. You sample 6 random items from <list allitems> /onblockbegin. After that, 4 unsampled items are left in that list. If you run <block relations> (or another block sampling from the list) again -- again taking 6 samples -- the list has to reset after 4 items, returning all 10 items back into the pool, and you may end up with the same item(s) sampled again. The solution is to make use of a list reset() before you do that, i.e.

/ onblockbegin = [list.allitems.reset(); ]

Similarly, you'll want to call the clearitems() function on the source and target lists before you assign any new items to them.

/ onblockbegin = [list.sourceitemsdislike.clearitems(); ...]


Re. #2: Yes. You need to link your source and target lists and set up the desired combinations via /onblockbegin.
<block relation>
/ onblockbegin = [list.sourceitemslike.appenditem(list.allitems.nextindex); list.sourceitemslike.appenditem(list.allitems.currentindex);
    list.sourceitemslike.appenditem(list.allitems.nextindex); list.sourceitemslike.appenditem(list.allitems.currentindex);
  
    list.sourceitemsdislike.appenditem(list.allitems.nextindex); list.sourceitemsdislike.appenditem(list.allitems.currentindex);
    list.sourceitemsdislike.appenditem(list.allitems.nextindex); list.sourceitemsdislike.appenditem(list.allitems.currentindex);

    list.targetitemslike.appenditem(list.allitems.nextindex); list.targetitemslike.appenditem(list.allitems.nextindex);
    list.targetitemslike.appenditem(list.targetitemslike.item(1)); list.targetitemslike.appenditem(list.targetitemslike.item(2));

    list.targetitemsdislike.appenditem(list.targetitemslike.item(1)); list.targetitemsdislike.appenditem(list.targetitemslike.item(2));
    list.targetitemsdislike.appenditem(list.targetitemslike.item(1)); list.targetitemsdislike.appenditem(list.targetitemslike.item(2));
]
/ trials = [1-8 = noreplace(relationlike, relationdislike)]
</block>

<trial relationlike>
/ stimulusframes = [1=sourcelike; 2=targetlike; 3=like]
/timeout = 5000
/pretrialpause= 1000
</trial>

<trial relationdislike>
/ stimulusframes = [1=sourcedislike; 2=targetdislike; 3=dislike]
/timeout = 5000
/pretrialpause= 1000
</trial>

<text like>
/items = ("mag")
/position= (50,50)
/fontstyle= ("ARIAL", 40, true, false, false, false, 5, 0)
/ select = replace
</text>

<text dislike>
/items = ("mag nicht")
/position= (50,50)
/fontstyle= ("ARIAL", 40, true, false, false, false, 5, 0)
/ select = replace
</text>

<text sourcelike>
/items = kollegen
/ select = list.sourceitemslike.nextvalue
/ position= (25,50)
/ size = (30%, 30%)
</text>

<text sourcedislike>
/items = kollegen
/ select = list.sourceitemsdislike.nextvalue
/ position= (25,50)
/ size = (30%, 30%)
</text>

<text targetlike>
/items = kollegen
/ select = list.targetitemslike.nextvalue
/ position= (75,50)
/ size = (30%, 30%)
</text>

<text targetdislike>
/items = kollegen
/ select = list.targetitemsdislike.nextvalue
/ position= (75,50)
/ size = (30%, 30%)
</text>

<item kollegen>
/1 = "2.jpg"
/2 = "3.jpg"
/3 = "4.jpg"
/4 = "5.bmp"
/5 = "6.jpg"
/6 = "7.jpg"
/7 = "8.jpg"
/8 = "9.bmp"
/9 = "10.jpg"
/10 = "11.bmp"
</item>

<list allitems>
/ poolsize = 10
/ selectionrate = always
</list>

<list sourceitemslike>
</list>

<list targetitemslike>
/ selectionmode = list.sourceitemslike.currentindex
</list>


<list sourceitemsdislike>
</list>

<list targetitemsdislike>
/ selectionmode = list.sourceitemsdislike.currentindex
</list>


EDITED TO FIX MISTAKE IN ABOVE SCRIPT.

Concerning the previous post, there are some questions left.
The relevant part of our script is attached.

1. Most of the time, sources and targets are presented correctly.
But in some trials the target-picture appears as source and target at the same time.
Can you detect the error?

2. In the current version, sources and targets are randomly combined.
In our experiment each source should be presented with each target once:
Source 1 + Target 1
Source 1 + Target 2
Source 2 + Target 1
Source 2 + Target 2
Source 3 + Target 1
Source 3 + Target 2
Source 4 + Target 1
Source 4 + Target 2
Is there any way to control this combination?

Thanks,
Christina

<block relation>
/ onblockbegin = [list.sourceitemslike.appenditem(list.allitems.nextindex); list.sourceitemslike.appenditem(list.allitems.nextindex);
    list.sourceitemsdislike.appenditem(list.allitems.nextindex); list.sourceitemsdislike.appenditem(list.allitems.nextindex);
    list.targetitems.appenditem(list.allitems.nextindex); list.targetitems.appenditem(list.allitems.nextindex);]
/ trials = [1-8 = noreplace(relationlike, relationdislike)]
</block>

<trial relationlike>
/ stimulusframes = [1=sourcelike; 2=target; 3=like]
/timeout = 5000
/pretrialpause= 1000
</trial>

<trial relationdislike>
/ stimulusframes = [1=sourcedislike; 2=target; 3=dislike]
/timeout = 5000
/pretrialpause= 1000
</trial>

<text like>
/items = ("mag")
/position= (50,50)
/fontstyle= ("ARIAL", 40, true, false, false, false, 5, 0)
/ select = replace
</text>

<text dislike>
/items = ("mag nicht")
/position= (50,50)
/fontstyle= ("ARIAL", 40, true, false, false, false, 5, 0)
/ select = replace
</text>

<picture sourcelike>
/items = kollegen
/ select = list.sourceitemslike.nextvalue
/ position= (25,50)
/ size = (30%, 30%)
</picture>

<picture sourcedislike>
/items = kollegen
/ select = list.sourceitemsdislike.nextvalue
/ position= (25,50)
/ size = (30%, 30%)
</picture>

<picture target>
/items = kollegen
/ select = list.targetitems.nextvalue
/ position= (75,50)
/ size = (30%, 30%)
</picture>

<item kollegen>
/1 = "2.jpg"
/2 = "3.jpg"
/3 = "4.jpg"
/4 = "5.bmp"
/5 = "6.jpg"
/6 = "7.jpg"
/7 = "8.jpg"
/8 = "9.bmp"
/9 = "10.jpg"
/10 = "11.bmp"
</item>

<list allitems>
/ poolsize = 10
/ selectionrate = always
</list>

<list sourceitemslike>
</list>

<list sourceitemsdislike>
</list>

<list targetitems>
</list>

Yes, that's perfectly possible. You can dynamically fill e.g. <list> elements at the beginning of the procedure. Suppose you have 6 items A-F. You want to randomly assign 4 of them as "source", 2 as "target".

<block myblock>
/ onblockbegin = [list.sourceitems.appenditem(list.allitems.nextindex); list.sourceitems.appenditem(list.allitems.nextindex);
    list.sourceitems.appenditem(list.allitems.nextindex); list.sourceitems.appenditem(list.allitems.nextindex);
    list.targetitems.appenditem(list.allitems.nextindex); list.targetitems.appenditem(list.allitems.nextindex);]
/ trials = [1-4=showsources; 5-6=showtargets]
</block>

<trial showsources>
/ stimulusframes = [1=sourcetxt]
/ validresponse = (57)
</trial>

<trial showtargets>
/ stimulusframes = [1=targettxt]
/ validresponse = (57)
</trial>

<text sourcetxt>
/items = myitems
/ select = list.sourceitems.nextvalue
/ txcolor = blue
</text>

<text targettxt>
/items = myitems
/ select = list.targetitems.nextvalue
/ txcolor = red
</text>

<item myitems>
/ 1 = "A"
/ 2 = "B"
/ 3 = "C"
/ 4 = "D"
/ 5 = "E"
/ 6 = "F"
</item>

<list allitems>
/ poolsize = 6
/ selectionrate = always
</list>

<list sourceitems>
</list>

<list targetitems>
</list>

Assigning the like / dislike dimension etc. works analogously.