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setting selection of stimuli with no replacement from same pool list


setting selection of stimuli with no replacement from same pool list
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WarrenL
WarrenL
WarrenL
posted 10 Years Ago
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Posts: 12, Visits: 102
Hi there,

I'm attempting to write a script for a Number Letter task where a pool of Number-Letter pairs (e.g. "A4", "B6")are presented on the screen in 2 positions. I'm having a couple of problems, mainly because I need to have a pool of potential pairs that need to be accessed by the two <text> stimuli (left side stimuli, right side stimuli) which are presented consecutively in sequencewith no repeats, no replacement.

What is the best option for this? If I implement an item pool pairs as below the <text> stimuli numberlettersleft and numberlettersright choose from the item pool exclusively, whereas would I want to happen is that if an item is used by the numberlettersleft (e.g. /1 "A3") then when numberlettersright is presented A3 is removed from the item pool, and that it doesn't repeat the same stimuli as the previous trial. 


<item pairs>
/1 = "A3"
/2 = "B4"
/3 = "C5"
/4 = "D4"
/5 = "G5"
/6 = "E6"
/7 = "A7"
/8 = "U8"
/9 = "I9"
</item>

<text numberlettersleft>
/ items = pairs
/ select = noreplacenorepeat
/ hposition = 45
/vposition = 45
/ color = black
</text>

<trial topleftpresletter>
/ stimulustimes = [1=numberlettersleft]
/ validresponse = ("d", "f", "j", "k")
</trial>

<text numberlettersright>
/ items = pairs
/ select = noreplacenorepeat
/ hposition = 55
/vposition = 45
/ color = black
</text>

<trial toprightpresletter>
/ stimulustimes = [1=numberlettersright]
/ validresponse = ("d", "f", "j", "k")
</trial>

------------------------------------------------------------------------------------
*** BLOCKS *****
------------------------------------------------------------------------------------

<block practice>
/trials = [1-18=sequence(topleftpresletter,toprightpresletter)]
</block>

*****
I've also thought about implementing a list (below) but for some reason when I refer to the list in the / items tag  in the text stimuli an error appears saying it cannot find the item pairs. Would using a list be a way around this and how do you refer to the list in the text stimuli? Any help at all is most appreciated - been pulling my hair out over this!

Thanks in advance, 

Warren


<list pairs>
/ selectionmode = random
/ items = ("A1", "B2", "C3", "D4")
</list>

<text numberlettersleft>
/ items = pairs
/ select = noreplacenorepeat
/ hposition = 45
/vposition = 45
/ color = black
</text>
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setting selection of stimuli with no replacement from same pool list
WarrenL - 10 Years Ago
     You simply need to define a *single selection pool* for the two...
Dave - 10 Years Ago
             Thanks Dave - you truly are a supreme being! The single pool works...
WarrenL - 10 Years Ago
                 Well, one could come up with at least a dozen ways to do this. And...
Dave - 10 Years Ago

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