Millisecond Forums

Randomly assing to /items property of pictures

https://forums.millisecond.com/Topic18863.aspx

By Chris-AT - 4/10/2016

Dear Users,

I am trying to assign randomly an <item> element  I defined to the pictures /items elemend. The idea is that there are 4 different picture sets (PicsTwentyFour_1 etc.) and those sets should be presented randomly (noreplace) in each of the 4 trials. I thought about creating an <item> element and define the <item> pictures in there (see <item sets>), but I get the error:
"missing double quotes". Is there any way to randomly assign an <item> element to the /items property of the pictures?

The full code is below

<values>
/ current_trial = 0
/ answer_filename = ""
/ condition = 0
/ current_set = 0
</values>

<data>
/ columns = (script.subjectid, script.groupid, values.condition, values.answer_filename, values.current_trial, trial.TrialSix.latency, trial.TrialTwentyFour.latency)
</data>

<expt assignment>
/ subjects = (1 of 1)
/ blocks = [1=assignment]
</expt>

<instruct>
/ windowsize = (70%,70%)
/ prevlabel = (" ")
/ nextkey = (" ")
/ lastlabel = "Klicken Sie hier, um fortzufahren"
/ nextlabel = "Klicken Sie hier, um fortzufahren"
/ fontstyle = ("Arial", 2.5%, false, false, false, false, 5, 0)
/ inputdevice = mouse
</instruct>

<block assignment>
/ preinstructions = (page.pre_page)
/ branch = [
    if (script.groupid == 1) block.BlSix
]

/ branch = [
    if (script.groupid == 2) block.BlTwentyFour
]
</block>


<block BlSix>
/ onblockbegin = [
    values.condition = 1;
]
/ trials = [1 = trial.TrClick; 2 = trial.TrialSix;
 3 = trial.TrClick; 4 = trial.TrialSix; 5 = trial.TrClick; 6 = trial.TrialSix; 7 = trial.TrClick; 8 = trial.TrialSix]
</block>

<block BlTwentyFour>
/ onblockbegin = [
    values.condition = 2;
]
/ trials = [1 = trial.TrClick; 2 = trial.TrialTwentyFour; 3 = trial.TrClick; 4 = trial.TrialTwentyFour; 5 = trial.TrClick; 6 = trial.TrialTwentyFour; 7 = trial.TrClick; 8 = trial.TrialTwentyFour]
</block>

<trial TrialSix>
/ stimulusframes = [1 = picture.PSix_1, picture.PSix_2, picture.PSix_3, picture.PSix_4, picture.PSix_5, picture.PSix_6]
/ validresponse = (picture.PSix_1, picture.PSix_2, picture.PSix_3, picture.PSix_4, picture.PSix_5, picture.PSix_6)
/ inputdevice = mouse
/ ontrialend = [
   
    if(trial.TrialSix.response == "PSix_1") {
        values.answer_filename = picture.PSix_1.currentitem;
    }
    else if(trial.TrialSix.response == "PSix_2") {
        values.answer_filename = picture.PSix_2.currentitem;
    }
    else if(trial.TrialSix.response == "PSix_3") {
        values.answer_filename = picture.PSix_3.currentitem;
    }
    else if(trial.TrialSix.response == "PSix_4") {
        values.answer_filename = picture.PSix_4.currentitem;
    }
    else if(trial.TrialSix.response == "PSix_5") {
        values.answer_filename = picture.PSix_5.currentitem;
    }
    else if(trial.TrialSix.response == "PSix_6") {
        values.answer_filename = picture.PSix_6.currentitem;
    }
]
</trial>

<trial TrialTwentyFour>
/ stimulusframes = [1 =
picture.PTwentyFour_1,
picture.PTwentyFour_2,
picture.PTwentyFour_3,
picture.PTwentyFour_4,
picture.PTwentyFour_5,
picture.PTwentyFour_6,
picture.PTwentyFour_7,
picture.PTwentyFour_8,
picture.PTwentyFour_9,
picture.PTwentyFour_10,
picture.PTwentyFour_11,
picture.PTwentyFour_12,
picture.PTwentyFour_13,
picture.PTwentyFour_14,
picture.PTwentyFour_15,
picture.PTwentyFour_16,
picture.PTwentyFour_17,
picture.PTwentyFour_18,
picture.PTwentyFour_19,
picture.PTwentyFour_20,
picture.PTwentyFour_21,
picture.PTwentyFour_22,
picture.PTwentyFour_23,
picture.PTwentyFour_24]
/ validresponse = (
picture.PTwentyFour_1,
picture.PTwentyFour_2,
picture.PTwentyFour_3,
picture.PTwentyFour_4,
picture.PTwentyFour_5,
picture.PTwentyFour_6,
picture.PTwentyFour_7,
picture.PTwentyFour_8,
picture.PTwentyFour_9,
picture.PTwentyFour_10,
picture.PTwentyFour_11,
picture.PTwentyFour_12,
picture.PTwentyFour_13,
picture.PTwentyFour_14,
picture.PTwentyFour_15,
picture.PTwentyFour_16,
picture.PTwentyFour_17,
picture.PTwentyFour_18,
picture.PTwentyFour_19,
picture.PTwentyFour_20,
picture.PTwentyFour_21,
picture.PTwentyFour_22,
picture.PTwentyFour_23,
picture.PTwentyFour_24)
/ inputdevice = mouse
/ ontrialend = [
   
    if(trial.TrialTwentyFour.response == "PTwentyFour_1") {
        values.answer_filename = picture.PTwentyFour_1.currentitem;
    }
    else if(trial.TrialTwentyFour.response == "PTwentyFour_2") {
        values.answer_filename = picture.PTwentyFour_2.currentitem;
    }
    else if(trial.TrialTwentyFour.response == "PTwentyFour_3") {
        values.answer_filename = picture.PTwentyFour_3.currentitem;
    }
    else if(trial.TrialTwentyFour.response == "PTwentyFour_4") {
        values.answer_filename = picture.PTwentyFour_4.currentitem;
    }
    else if(trial.TrialTwentyFour.response == "PTwentyFour_5") {
        values.answer_filename = picture.PTwentyFour_5.currentitem;
    }
    else if(trial.TrialTwentyFour.response == "PTwentyFour_6") {
        values.answer_filename = picture.PTwentyFour_6.currentitem;
    }
    else if(trial.TrialTwentyFour.response == "PTwentyFour_7") {
        values.answer_filename = picture.PTwentyFour_7.currentitem;
    }
    else if(trial.TrialTwentyFour.response == "PTwentyFour_8") {
        values.answer_filename = picture.PTwentyFour_8.currentitem;
    }
    else if(trial.TrialTwentyFour.response == "PTwentyFour_9") {
        values.answer_filename = picture.PTwentyFour_9.currentitem;
    }
    else if(trial.TrialTwentyFour.response == "PTwentyFour_10") {
        values.answer_filename = picture.PTwentyFour_10.currentitem;
    }
    else if(trial.TrialTwentyFour.response == "PTwentyFour_11") {
        values.answer_filename = picture.PTwentyFour_11.currentitem;
    }
    else if(trial.TrialTwentyFour.response == "PTwentyFour_12") {
        values.answer_filename = picture.PTwentyFour_12.currentitem;
    }
    else if(trial.TrialTwentyFour.response == "PTwentyFour_13") {
        values.answer_filename = picture.PTwentyFour_13.currentitem;
    }
    else if(trial.TrialTwentyFour.response == "PTwentyFour_14") {
        values.answer_filename = picture.PTwentyFour_14.currentitem;
    }
    else if(trial.TrialTwentyFour.response == "PTwentyFour_15") {
        values.answer_filename = picture.PTwentyFour_15.currentitem;
    }
    else if(trial.TrialTwentyFour.response == "PTwentyFour_16") {
        values.answer_filename = picture.PTwentyFour_16.currentitem;
    }
    else if(trial.TrialTwentyFour.response == "PTwentyFour_17") {
        values.answer_filename = picture.PTwentyFour_17.currentitem;
    }
    else if(trial.TrialTwentyFour.response == "PTwentyFour_18") {
        values.answer_filename = picture.PTwentyFour_18.currentitem;
    }
    else if(trial.TrialTwentyFour.response == "PTwentyFour_19") {
        values.answer_filename = picture.PTwentyFour_19.currentitem;
    }
    else if(trial.TrialTwentyFour.response == "PTwentyFour_20") {
        values.answer_filename = picture.PTwentyFour_20.currentitem;
    }
    else if(trial.TrialTwentyFour.response == "PTwentyFour_21") {
        values.answer_filename = picture.PTwentyFour_21.currentitem;
    }
    else if(trial.TrialTwentyFour.response == "PTwentyFour_22") {
        values.answer_filename = picture.PTwentyFour_22.currentitem;
    }
    else if(trial.TrialTwentyFour.response == "PTwentyFour_23") {
        values.answer_filename = picture.PTwentyFour_23.currentitem;
    }
    else if(trial.TrialTwentyFour.response == "PTwentyFour_24") {
        values.answer_filename = picture.PTwentyFour_24.currentitem;
    }
]
</trial>

<trial TrClick>
/ stimulusframes = [1 = shape.ShClick, text.TeClickOnShape]
/ validresponse = (shape.ShClick)
/ inputdevice = mouse
/ ontrialbegin = [
        values.current_trial += 1;
        values.answer_filename = "";
]
</trial>


###########################################
Picture Sets for Condition with 6 Pictures
###########################################
<picture PSix_1>
/ items = item.PicsSix
/ select = counter.PicSelectorSix.selectedvalue
/ position = (20%,25%)
</picture>

<picture PSix_2>
/ items = item.PicsSix
/ select = counter.PicSelectorSix.selectedvalue
/ position = (40%,25%)
</picture>

<picture PSix_3>
/ items = item.PicsSix
/ select = counter.PicSelectorSix.selectedvalue
/ position = (60%,25%)
</picture>

<picture PSix_4>
/ items = item.PicsSix
/ select = counter.PicSelectorSix.selectedvalue
/ position = (20%,50%)
</picture>

<picture PSix_5>
/ items = item.PicsSix
/ select = counter.PicSelectorSix.selectedvalue
/ position = (40%,50%)
</picture>

<picture PSix_6>
/ items = item.PicsSix
/ select = counter.PicSelectorSix.selectedvalue
/ position = (60%,50%)
</picture>


###########################################
Picture Sets for Condition with 24 Pictures
###########################################

<picture PTwentyFour_1>
/ items = counter.selectSet.selectedvalue
/ select = counter.PicSelectorTwentyFour.selectedvalue
/ position = (10%,10%)
/ height = 20%
/ width = 20%
</picture>

<picture PTwentyFour_2>
/ items = item.PicsTwentyFour_2
/ select = counter.PicSelectorTwentyFour.selectedvalue
/ position = (25%,10%)
/ height = 20%
/ width = 20%
</picture>

<picture PTwentyFour_3>
/ items = item.PicsTwentyFour_3
/ select = counter.PicSelectorTwentyFour.selectedvalue
/ position = (40%,10%)
/ height = 20%
/ width = 20%
</picture>

<picture PTwentyFour_4>
/ items = item.PicsTwentyFour_1
/ select = counter.PicSelectorTwentyFour.selectedvalue
/ position = (55%,10%)
/ height = 20%
/ width = 20%
</picture>

<picture PTwentyFour_5>
/ items = item.PicsTwentyFour_1
/ select = counter.PicSelectorTwentyFour.selectedvalue
/ position = (70%,10%)
/ height = 20%
/ width = 20%
</picture>

<picture PTwentyFour_6>
/ items = item.PicsTwentyFour_4
/ select = counter.PicSelectorTwentyFour.selectedvalue
/ position = (85%,10%)
/ height = 20%
/ width = 20%
</picture>

<picture PTwentyFour_7>
/ items = item.PicsTwentyFour_1
/ select = counter.PicSelectorTwentyFour.selectedvalue
/ position = (10%,30%)
/ height = 20%
/ width = 20%
</picture>

<picture PTwentyFour_8>
/ items = item.PicsTwentyFour_3
/ select = counter.PicSelectorTwentyFour.selectedvalue
/ position = (25%,30%)
/ height = 20%
/ width = 20%
</picture>

<picture PTwentyFour_9>
/ items = item.PicsTwentyFour_2
/ select = counter.PicSelectorTwentyFour.selectedvalue
/ position = (40%,30%)
/ height = 20%
/ width = 20%
</picture>

<picture PTwentyFour_10>
/ items = item.PicsTwentyFour_1
/ select = counter.PicSelectorTwentyFour.selectedvalue
/ position = (55%,30%)
/ height = 20%
/ width = 20%
</picture>

<picture PTwentyFour_11>
/ items = item.PicsTwentyFour_1
/ select = counter.PicSelectorTwentyFour.selectedvalue
/ position = (70%,30%)
/ height = 20%
/ width = 20%
</picture>

<picture PTwentyFour_12>
/ items = item.PicsTwentyFour_1
/ select = counter.PicSelectorTwentyFour.selectedvalue
/ position = (85%,30%)
/ height = 20%
/ width = 20%
</picture>

<picture PTwentyFour_13>
/ items = item.PicsTwentyFour_1
/ select = counter.PicSelectorTwentyFour.selectedvalue
/ position = (10%,50%)
/ height = 20%
/ width = 20%
</picture>

<picture PTwentyFour_14>
/ items = item.PicsTwentyFour_1
/ select = counter.PicSelectorTwentyFour.selectedvalue
/ position = (25%,50%)
/ height = 20%
/ width = 20%
</picture>

<picture PTwentyFour_15>
/ items = item.PicsTwentyFour_1
/ select = counter.PicSelectorTwentyFour.selectedvalue
/ position = (40%,50%)
/ height = 20%
/ width = 20%
</picture>

<picture PTwentyFour_16>
/ items = item.PicsTwentyFour_1
/ select = counter.PicSelectorTwentyFour.selectedvalue
/ position = (55%,50%)
/ height = 20%
/ width = 20%
</picture>

<picture PTwentyFour_17>
/ items = item.PicsTwentyFour_1
/ select = counter.PicSelectorTwentyFour.selectedvalue
/ position = (70%,50%)
/ height = 20%
/ width = 20%
</picture>

<picture PTwentyFour_18>
/ items = item.PicsTwentyFour_1
/ select = counter.PicSelectorTwentyFour.selectedvalue
/ position = (85%,50%)
/ height = 20%
/ width = 20%
</picture>

<picture PTwentyFour_19>
/ items = item.PicsTwentyFour_1
/ select = counter.PicSelectorTwentyFour.selectedvalue
/ position = (10%,70%)
/ height = 20%
/ width = 20%
</picture>

<picture PTwentyFour_20>
/ items = item.PicsTwentyFour_1
/ select = counter.PicSelectorTwentyFour.selectedvalue
/ position = (25%,70%)
/ height = 20%
/ width = 20%
</picture>

<picture PTwentyFour_21>
/ items = item.PicsTwentyFour_1
/ select = counter.PicSelectorTwentyFour.selectedvalue
/ position = (40%,70%)
/ height = 20%
/ width = 20%
</picture>

<picture PTwentyFour_22>
/ items = item.PicsTwentyFour_1
/ select = counter.PicSelectorTwentyFour.selectedvalue
/ position = (55%,70%)
/ height = 20%
/ width = 20%
</picture>

<picture PTwentyFour_23>
/ items = item.PicsTwentyFour_1
/ select = counter.PicSelectorTwentyFour.selectedvalue
/ position = (70%,70%)
/ height = 20%
/ width = 20%
</picture>

<picture PTwentyFour_24>
/ items = item.PicsTwentyFour_1
/ select = counter.PicSelectorTwentyFour.selectedvalue
/ position = (85%,70%)
/ height = 20%
/ width = 20%
</picture>

<counter selectSet>
/ select = noreplace
/ items = item.sets
/ selectionrate = always
</counter>



<counter PicSelectorSix>
/ select = noreplace
/ items = (1,2,3,4,5,6)
/ selectionrate = always
</counter>

<counter PicSelectorTwentyFour>
/ select = noreplace
/ items = (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24)
/ selectionrate = always
</counter>


<item PicsSix>
/ 1 = "1.png"
/ 2 = "2.png"
/ 3 = "3.png"
/ 4 = "4.png"
/ 5 = "5.png"
/ 6 = "6.png"
</item>

<item PicsTwentyFour_1>
/ 1 = "Schokolade/Set_1/3bit_1.jpg"
/ 2 = "Schokolade/Set_1/bananko_2.jpg"
/ 3 = "Schokolade/Set_1/bobby-caramel.jpg"
/ 4 = "Schokolade/Set_1/crunchie_1.jpg"
/ 5 = "Schokolade/Set_1/flake_1.jpg"
/ 6 = "Schokolade/Set_1/gematogen.jpg"
/ 7 = "Schokolade/Set_1/gofret.jpg"
/ 8 = "Schokolade/Set_1/huesitos.jpg"
/ 9 = "Schokolade/Set_1/ion_1.jpg"
/ 10 = "Schokolade/Set_1/japp_1.jpg"
/ 11 = "Schokolade/Set_1/kiss_1.jpg"
/ 12 = "Schokolade/Set_1/lotto_1.jpg"
/ 13 = "Schokolade/Set_1/margot_1.jpg"
/ 14 = "Schokolade/Set_1/milk-duds.jpg"
/ 15 = "Schokolade/Set_1/mrgoodbar.jpg"
/ 16 = "Schokolade/Set_1/munchies_1.jpg"
/ 17 = "Schokolade/Set_1/prince-polo_1.jpg"
/ 18 = "Schokolade/Set_1/reeses.jpg"
/ 19 = "Schokolade/Set_1/space_1.jpg"
/ 20 = "Schokolade/Set_1/sport.jpg"
/ 21 = "Schokolade/Set_1/szamba.jpg"
/ 22 = "Schokolade/Set_1/vegan.jpg"
/ 23 = "Schokolade/Set_1/whatchamacallit.jpg"
/ 24 = "Schokolade/Set_1/yorkie_2.jpg"
</item>

<item PicsTwentyFour_2>
/ 1 = "Schokolade/Set_2/babyruth_1.jpg"
/ 2 = "Schokolade/Set_2/boost.jpg"
/ 3 = "Schokolade/Set_2/broderick-belgy_1.jpg"
/ 4 = "Schokolade/Set_2/caramellokoala.jpg"
/ 5 = "Schokolade/Set_2/chocolatefish.jpg"
/ 6 = "Schokolade/Set_2/choc-ovo.jpg"
/ 7 = "Schokolade/Set_2/cookiesandcream_1.jpg"
/ 8 = "Schokolade/Set_2/curly-wurly_2.jpg"
/ 9 = "Schokolade/Set_2/dairy-milk_1.jpg"
/ 10 = "Schokolade/Set_2/derby_1.jpg"
/ 11 = "Schokolade/Set_2/moro-gold.jpg"
/ 12 = "Schokolade/Set_2/nutrageous_1.jpg"
/ 13 = "Schokolade/Set_2/palle.jpg"
/ 14 = "Schokolade/Set_2/pawelek-toffi.jpg"
/ 15 = "Schokolade/Set_2/peppy-chews.jpg"
/ 16 = "Schokolade/Set_2/pinapple-lumps.jpg"
/ 17 = "Schokolade/Set_2/primola-cremita_1.jpg"
/ 18 = "Schokolade/Set_2/princessa-kokos.jpg"
/ 19 = "Schokolade/Set_2/sweet-marie_1.jpg"
/ 20 = "Schokolade/Set_2/tupla_1.jpg"
/ 21 = "Schokolade/Set_2/vegan.jpg"
/ 22 = "Schokolade/Set_2/white-knight_1.jpg"
/ 23 = "Schokolade/Set_2/wispa_1.jpg"
/ 24 = "Schokolade/Set_2/zero_1.jpg"
</item>

<item PicsTwentyFour_3>
/ 1 = "Schokolade/Set_3/100grand.jpg"
/ 2 = "Schokolade/Set_3/charleston-chew-mini.jpg"
/ 3 = "Schokolade/Set_3/cherry-ripe_1.jpg"
/ 4 = "Schokolade/Set_3/dairy-milk-caramel.jpg"
/ 5 = "Schokolade/Set_3/galaxy.jpg"
/ 6 = "Schokolade/Set_3/insidestory.jpg"
/ 7 = "Schokolade/Set_3/karl-fazer-yoghurt.jpg"
/ 8 = "Schokolade/Set_3/kesten-dessert.jpg"
/ 9 = "Schokolade/Set_3/lunch-bar.jpg"
/ 10 = "Schokolade/Set_3/mrtom.jpg"
/ 11 = "Schokolade/Set_3/nougatti.jpg"
/ 12 = "Schokolade/Set_3/perky-nana.jpg"
/ 13 = "Schokolade/Set_3/princessa-hasselnuss.jpg"
/ 14 = "Schokolade/Set_3/reeses-big-cup.jpg"
/ 15 = "Schokolade/Set_3/sugar-babies.jpg"
/ 16 = "Schokolade/Set_3/take-five.jpg"
/ 17 = "Schokolade/Set_3/tempo.jpg"
/ 18 = "Schokolade/Set_3/tex.jpg"
/ 19 = "Schokolade/Set_3/tim-tam-chewy-caramel.jpg"
/ 20 = "Schokolade/Set_3/tokke.jpg"
/ 21 = "Schokolade/Set_3/tootsie-roll.jpg"
/ 22 = "Schokolade/Set_3/tv-bar-white.jpg"
/ 23 = "Schokolade/Set_3/vegan_.jpg"
/ 24 = "Schokolade/Set_3/yankie.jpg"
</item>
Im Ordner ist ein Bild zu viel, auf Email von Christina warten!
<item PicsTwentyFour_4>
/ 1 = "Schokolade/Set_4/corny-big-schoko.jpg"
/ 2 = "Schokolade/Set_4/debron-lifestyle-candy-milk-chocolate.jpg"
/ 3 = "Schokolade/Set_4/duplo-big-pack.jpg"
/ 4 = "Schokolade/Set_4/lindt-edel-nougat-pur.jpg"
/ 5 = "Schokolade/Set_4/lindt-hello-caramel-brownie-stick.jpg"
/ 6 = "Schokolade/Set_4/lindt-hello-sundae-choco.jpg"
/ 7 = "Schokolade/Set_4/magnum-chocolate-almond.jpg"
/ 8 = "Schokolade/Set_4/maltesers-teasers.jpg"
/ 9 = "Schokolade/Set_4/mars-2er.jpg"
/ 10 = "Schokolade/Set_4/merci-finest-selection-400g.jpg"
/ 11 = "Schokolade/Set_4/milka-milketten-haselnuss.jpg"
/ 12 = "Schokolade/Set_4/milky-way-multipack.jpg"
/ 13 = "Schokolade/Set_4/nestl--crunch-white(1).jpg"
/ 14 = "Schokolade/Set_4/nippon-haeppchen-200g.jpg"
/ 15 = "Schokolade/Set_4/pick-up--black--amp--white-5er.jpg"
/ 16 = "Schokolade/Set_4/Raw-Bite_Protein-500x500.jpg"
/ 17 = "Schokolade/Set_4/ritter-sport-voll-nuss.jpg"
/ 18 = "Schokolade/Set_4/ROOBAR-Protein-Chia-und-Chocolate-30g.jpg"
/ 19 = "Schokolade/Set_4/schogetten-alpenvollmilch.jpg"
/ 20 = "Schokolade/Set_4/schwartau-clever-snack-maracuja.jpg"
/ 21 = "Schokolade/Set_4/shokomonk-wei-e-schokolade-cookies.jpg"
/ 22 = "Schokolade/Set_4/Toblerone-100g.jpg"
/ 23 = "Schokolade/Set_4/viba-schicht-nougat-riegel-40g.jpg"
/ 24 = "Schokolade/Set_4/yogurette-300g.jpg"
</item>

<item sets>
/ 1 = item.PicsTwentyFour_1
/ 2 = item.PicsTwentyFour_2
/ 3 = item.PicsTwentyFour_3
/ 4 = item.PicsTwentyFour_4
</item>


<text TeClickOnShape>
/ items = ("Bitte auf das schwarze Viereck klicken.")
/ select = replace
/ position = (50%,20%)
</text>

<shape ShClick>
/ color = black
/ size = (10px,10px)
/ position = (50%,90%)
</shape>

<page pre_page>
Danke für Ihre Teilnahme an unserer Studie...
</page>
By Dave - 4/10/2016

No, you cannot assing <item> elements randomly to <picture> elements. What you need to do is work with *item numbers*.

All your items should be in a *single* <item> element. The respective item *numbers* are what make up a set as in

<item PicsTwentyFour>
/ 1 = "Schokolade/Set_1/3bit_1.jpg"
...
/ 24 = "Schokolade/Set_1/yorkie_2.jpg"

/ 25 = "Schokolade/Set_2/babyruth_1.jpg"
...
/ 48 = "Schokolade/Set_2/zero_1.jpg"

/ 49 = "Schokolade/Set_3/100grand.jpg"
...
/ 72 = "Schokolade/Set_3/yankie.jpg"

/ 73 = "Schokolade/Set_4/corny-big-schoko.jpg"
...
/ 96 = "Schokolade/Set_4/yogurette-300g.jpg"
</item>

<list PicSelectorTwentyFour_1>
/ items = (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24)
/ selectionrate = always
</list>

<list PicSelectorTwentyFour_2>
/ items = (25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48)
/ selectionrate = always
</list>

<list PicSelectorTwentyFour_3>
/ items = (49,...,72)
/ selectionrate = always
</list>

<list PicSelectorTwentyFour_4>
/ items = (73,...,96)
/ selectionrate = always
</list>

You can then draw the applicable item numbers from the respective set according to the set chosen:

<picture PTwentyFour_1>
/ items = PicsTwentyFour
/ select = list.chosenset.nextvalue
/ position = (10%,10%)
/ height = 20%
/ width = 20%
</picture>

...

with

<list chosenset>
/ items = (list.PicSelectorTwentyFour_1.nextvalue, list.PicSelectorTwentyFour_2.nextvalue, list.PicSelectorTwentyFour_3.nextvalue, list.PicSelectorTwentyFour_4.nextvalue)
...
</list>


Here's a minimal example to illustrate:

<block myblock>
/ trials = [1-2 = mytrial]
</block>

<values>
/ setnumber = 0
</values>

<trial mytrial>
/ ontrialbegin = [values.setnumber = list.setnumber.nextvalue; ]
/ stimulusframes = [1=s1,s2,s3,s4]
/ validresponse = (57)
</trial>

<text s1>
/ items = allitems
/ select = list.chosenset.nextvalue
/ position = (20%, 50%)
</text>

<text s2>
/ items = allitems
/ select = list.chosenset.nextvalue
/ position = (40%, 50%)
</text>

<text s3>
/ items = allitems
/ select = list.chosenset.nextvalue
/ position = (60%, 50%)
</text>

<text s4>
/ items = allitems
/ select = list.chosenset.nextvalue
/ position = (80%, 50%)
</text>

<item allitems>
/ 1 = "A1"
/ 2 = "A2"
/ 3 = "A3"
/ 4 = "A4"

/ 5 = "B1"
/ 6 = "B2"
/ 7 = "B3"
/ 8 = "B4"
</item>

<list set1>
/ items = (1,2,3,4)
/ selectionrate = always
</list>

<list set2>
/ items = (5,6,7,8)
/ selectionrate = always
</list>

<list setnumber>
/ items = (1,2)
</list>

<list chosenset>
/ items = (list.set1.nextvalue, list.set2.nextvalue)
/ selectionrate = always
/ selectionmode = values.setnumber
</list>
By Chris-AT - 4/10/2016

Thank you so much, Dave. It didn't occur to me that selectionmode can also evaluate in an integer to be chosen.

Thanks again,
Chris