By jens - 9/26/2016
Hello,
I am trying to program an affective Simon task. Participants judge either the color of the stimulus word (green/blue) or when presented in white is emotional value of the stimulus word (positive/negative). I have a list of 4 x 10 words (belonging to different categories: negtra, negemo, postra, posemo). In the experimental block, I need to present each word once in white, blue or green, which at the moment I do not achieve. Words are presented more often than one time in a specific color. The reason for this is obvious. At the moment, there is just random selection which does not work out. I assume that the solution is a (or more) list(s). But I do not manage to set up such list.
Suggestions are welcome.
Best regards Jens
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By Dave - 9/26/2016
You need to pair your word items / item numbers with the desired display colors. For the sake of example, suppose you have 4 words and 3 display colors -- you want to display each word in each color exactly once, i.e., you have 4 x 3 = 12 combinations:
<block myblock>
/ screencolor = black
/ trials = [1-12 = mytrial]
</block>
<trial mytrial>
/ ontrialbegin = [values.worditemnumber = list.worditemnumbers.nextvalue; values.wordcolor = list.wordcolors.nextvalue;
text.word.textcolor = values.wordcolor]
/ stimulusframes = [1=word]
/ validresponse = (57)
</trial>
<text word>
/ items = worditems
/ select = values.worditemnumber
/ txbgcolor = black
/ fontstyle = ("Arial", 5%)
</text>
<item worditems>
/ 1 = "Bird"
/ 2 = "Cat"
/ 3 = "Dog"
/ 4 = "Eel"
</item>
<list worditemnumbers>
/ items = (1,1,1,
2,2,2,
3,3,3,
4,4,4)
</list>
<list wordcolors>
/ items = (blue, green, white,
blue, green, white,
blue, green, white,
blue, green, white)
/ selectionmode = list.worditemnumbers.currentindex
</list>
<values>
/ worditemnumber = 1
/ wordcolor = black
</values>
<data>
/ columns = [date time subject group blocknum blockcode trialnum trialcode response latency correct stimulusitem values.worditemnumber values.wordcolor]
/ separatefiles = true
</data>
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By jens - 9/26/2016
Hello,
thanks a lot, that helps. I hope I can expand it to my four conditions, but that should work. Any suggestion why values.wordcolor gives me numbers instead of color labels, e.g. 4278255360, 4294901760 and 4294967295?
Best regards Jens
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By Dave - 9/27/2016
The internal representation of colors is ultimately a numerical value (not a label), hence values.wordcolor is numerical.
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By jens - 9/27/2016
Hello,
ok, understood. Thanks a lot. The extension to four categories of words works. :-)
Best regards Jens
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