Millisecond Forums

If you want your <trial> to display nine stimuli simultaneously, you need nine <text> elements and your <trial> needs to display all those nine text elements via its /stimulusframes.

Thanks for your answer, Dave. 
But how do I ensure, that these nine stimuli are extracted randomised from a pool of words (3 words per category, as seen above)? In another experiment, I already did it like you advice now, but I don't know how I integrate this into my current script. 

Dear Dave, 
I now managed to display nine stimuli simultaneously. Still the problem is that the words are not randomised and that the first three words are Category A, the next three Category B and so on. 
Do you have a solution to solve this? 
Thanks a lot in advance. 

<list PositiveWörter>
/items=["Heimat"; "Humor"; "Reise"; "Sonne"; "Urlaub"; "Treue"; "Party"; "Advent"]
/selectionmode = random
/selectionrate = always
</list>

<list NeutraleWörter>
/items=["Bedarf"; "Länge"; "Kader"; "Marke"; "Strecke"; "Runde"; "Handel"; "Finger"]
/selectionmode = random
/selectionrate = always
</list>

<list NegativeWörter>
/items=["Mörder"; "Leiche"; "Waffe"; "Armut"; "Panik"; "Falle"; "Verlust"; "Unfall"]
/selectionmode = random
/selectionrate = always
</list>

<item WortlisteEnkodierung>
/ 1 = "Heimat"
/ 2 = "Humor"
/ 3 = "Reise"
/ 4 = "Sonne"
/ 5 = "Urlaub"
/ 6 = "Treue"
/ 7 = "Party"
/ 8 = "Advent"

/ 9 = "Bedarf"
/ 10 = "Länge"
/ 11 = "Kader"
/ 12 = "Marke"
/ 13 = "Strecke"
/ 14 = "Runde"
/ 15 = "Handel"
/ 16 = "Finger"

/ 17 = "Mörder"
/ 18 = "Leiche"
/ 19 = "Waffe"
/ 20 = "Armut"
/ 21 = "Panik"
/ 22 = "Falle"
/ 23 = "Verlust"
/ 24 = "Unfall"
</item>

<text mytext1>
/ items = WortlisteEnkodierung
/ select = list.masterlist.1
/ hposition = 50%
/ vposition = 10%
</text>

<text mytext2>
/ items = WortlisteEnkodierung
/ select = list.masterlist.2
/ hposition = 50%
/ vposition = 19%
</text>

<text mytext3>
/ items = WortlisteEnkodierung
/ select = list.masterlist.3
/ hposition = 50%
/ vposition = 28%
</text>

<text mytext4>
/ items = WortlisteEnkodierung
/ select = list.masterlist.4
/ hposition = 50%
/ vposition = 37%
</text>

<text mytext5>
/ items = WortlisteEnkodierung
/ select = list.masterlist.5
/ hposition = 50%
/ vposition = 46%
</text>

<text mytext6>
/ items = WortlisteEnkodierung
/ select = list.masterlist.6
/ hposition = 50%
/ vposition = 55%
</text>

<text mytext7>
/ items = WortlisteEnkodierung
/ select = list.masterlist.7
/ hposition = 50%
/ vposition = 64%
</text>

<text mytext8>
/ items = WortlisteEnkodierung
/ select = list.masterlist.8
/ hposition = 50%
/ vposition = 73%
</text>

<text mytext9>
/ items = WortlisteEnkodierung
/ select = list.masterlist.9
/ hposition = 50%
/ vposition = 82%
</text>

<list masterlist>
</list>

<list PositiveWörter_itemnumbers>
/ items = (1,2,3,4,5,6,7,8)
/selectionrate = always
</list>

<list NeutraleWörter_itemnumbers>
/items = (9, 10, 11, 12,13,14,15,16)
/selectionrate = always
</list>

<list NegativeWörter_itemnumbers>
/items = (17,18,19, 20,21,22,23,24)
/selectionrate = always
</list>

<trial mytrial>
/ stimulusframes = [1= mytext1, mytext2, mytext3, mytext4, mytext5, mytext6, mytext7, mytext8, mytext9]
/timeout = 4000
</trial>

<block wordencoding>
/ trials = [1 = noreplace(mytrial)]

> Still the problem is that the words are not randomised

So why don't you randomize them? I'm having trouble understanding your use of <list>s, the setup does not make sense to me.

<text mytext1>
/ items = WortlisteEnkodierung
/ select = list.masterlist.1
/ hposition = 50%
/ vposition = 10%
</text>

should read

<text mytext1>
/ items = WortlisteEnkodierung
/ select = list.masterlist.nextvalue
/ hposition = 50%
/ vposition = 10%
</text>

and so forth for the other 8 <text> elements, and

<list masterlist>
</list>

needs to be set to /selectionrate = always if you want to sample multiple item numbers from it in a given trial:

<list masterlist>
/ selectionrate = always
</list>