list selection based on criteria

nfbecker — Thu, 17 Jul 2025 12:31:39 GMT

Hi!
I'm struggeling to program a presentation of pictures and texts with randomized selection based on specific criteria: I want to randomly select three out of five pictures from each category A and B. For each selected picture, I also want to select a text corresponding to the same category A or B. Within a block, the trials could look like this: picA1-textA2, picA2-textA1, picB1-textB5, ... (each picture-text combination is presented twice)

I've tried different settings using the variables within /onBlockBegin. But currently, I either manage to present the corresponding pairs by item numbers (picA1-textA1) or present compleatly random combinations and mixing A and B incorrectly (picA1-textB2).
What I'm looking for is something like "if list.selected_picA then list.selected_textA", but I cannot figure out how to program this dependency correctly.
I would really appreciate your help or hints!

This is the code I'm working with at the moment:
<item pic_all>
/ 1 = "picA1"
/ 2 = "picA2"
/ 3 = "picA3"
/ 4 = "picA4"
/ 5 = "picA5"
/ 6 = "picB1"
/ 7 = "picB2"
/ 8 = "picB3"
/ 9 = "picB4"
/ 10 = "picB5"
</item>
<list selected_pic>
</list>
<text pic>
/ items = pic_all
/ position = (50, 40)
/ select = list.selected_pic.nextvalue
</text>
<list selected_picA>
/ items = (1-5)
/ selectionrate = always
</list>
<list selected_picB>
/ items = (6-10)
/ selectionrate = always
</list>

<item text_all>
/ 1 = "textA1"
/ 2 = "textA2"
/ 3 = "textA3"
/ 4 = "textA4"
/ 5 = "textA5"
/ 6 = "textB1"
/ 7 = "textB2"
/ 8 = "textB3"
/ 9 = "textB4"
/ 10 = "textB5"
</item>
<list selected_text>
</list>
<text text>
/ items = text_all
/ position = (50, 55)
/ select = list.selected_text.nextvalue
</text>
<list selected_textA>
/ items = (1-5)
/ selectionrate = always
</list>
<list selected_textB>
/ items = (6-10)
/ selectionrate = always
</list>

<trial trial>
/ stimulusframes = [1 = pic, text]
/ timeout = 1000
</trial>
<block block>
/ onblockbegin = [
var i = 0;
while (i < 3) {list.selected_pic.appendItem(list.selected_picA.nextValue); i += 1; };
i = 0;
while (i < 3) {list.selected_pic.appendItem(list.selected_picB.nextValue); i += 1; };
var j = 0;
while (j < 3) {list.selected_text.appendItem(list.selected_textA.nextValue); j += 1; };
j = 0;
while (j < 3) {list.selected_text.appendItem(list.selected_textB.nextValue); j += 1; };]
/ trials = [1-12 = trial]
</block>

RE: list selection based on criteria

Dave — Thu, 17 Jul 2025 12:31:39 GMT

+x[quote]

[b]nfbecker - 7/17/2025[/b]
Hi!
I'm struggeling to program a presentation of pictures and texts with randomized selection based on specific criteria: I want to randomly select three out of five pictures from each category A and B. For each selected picture, I also want to select a text corresponding to the same category A or B. Within a block, the trials could look like this: picA1-textA2, picA2-textA1, picB1-textB5, ... (each picture-text combination is presented twice)

I've tried different settings using the variables within /onBlockBegin. But currently, I either manage to present the corresponding pairs by item numbers (picA1-textA1) or present compleatly random combinations and mixing A and B incorrectly (picA1-textB2).
What I'm looking for is something like "if list.selected_picA then list.selected_textA", but I cannot figure out how to program this dependency correctly.
I would really appreciate your help or hints!

This is the code I'm working with at the moment:
<item pic_all>
/ 1 = "picA1"
/ 2 = "picA2"
/ 3 = "picA3"
/ 4 = "picA4"
/ 5 = "picA5"
/ 6 = "picB1"
/ 7 = "picB2"
/ 8 = "picB3"
/ 9 = "picB4"
/ 10 = "picB5"
</item>
<list selected_pic>
</list>
<text pic>
/ items = pic_all
/ position = (50, 40)
/ select = list.selected_pic.nextvalue
</text>
<list selected_picA>
/ items = (1-5)
/ selectionrate = always
</list>
<list selected_picB>
/ items = (6-10)
/ selectionrate = always
</list>

<item text_all>
/ 1 = "textA1"
/ 2 = "textA2"
/ 3 = "textA3"
/ 4 = "textA4"
/ 5 = "textA5"
/ 6 = "textB1"
/ 7 = "textB2"
/ 8 = "textB3"
/ 9 = "textB4"
/ 10 = "textB5"
</item>
<list selected_text>
</list>
<text text>
/ items = text_all
/ position = (50, 55)
/ select = list.selected_text.nextvalue
</text>
<list selected_textA>
/ items = (1-5)
/ selectionrate = always
</list>
<list selected_textB>
/ items = (6-10)
/ selectionrate = always
</list>

<trial trial>
/ stimulusframes = [1 = pic, text]
/ timeout = 1000
</trial>
<block block>
/ onblockbegin = [
var i = 0;
while (i < 3) {list.selected_pic.appendItem(list.selected_picA.nextValue); i += 1; };
i = 0;
while (i < 3) {list.selected_pic.appendItem(list.selected_picB.nextValue); i += 1; };
var j = 0;
while (j < 3) {list.selected_text.appendItem(list.selected_textA.nextValue); j += 1; };
j = 0;
while (j < 3) {list.selected_text.appendItem(list.selected_textB.nextValue); j += 1; };]
/ trials = [1-12 = trial]
</block>

[/quote]

You just need to pair the pic and text list, it's not complicated.

[code]<item pic_all>
/ 1 = "picA1"
/ 2 = "picA2"
/ 3 = "picA3"
/ 4 = "picA4"
/ 5 = "picA5"
/ 6 = "picB1"
/ 7 = "picB2"
/ 8 = "picB3"
/ 9 = "picB4"
/ 10 = "picB5"
</item>
<list selected_pic>
</list>
<text pic>
/ items = pic_all
/ position = (50, 40)
/ select = list.selected_pic.nextvalue
</text>
<list selected_picA>
/ items = (1-5)
/ selectionrate = always
</list>
<list selected_picB>
/ items = (6-10)
/ selectionrate = always
</list>

<item text_all>
/ 1 = "textA1"
/ 2 = "textA2"
/ 3 = "textA3"
/ 4 = "textA4"
/ 5 = "textA5"
/ 6 = "textB1"
/ 7 = "textB2"
/ 8 = "textB3"
/ 9 = "textB4"
/ 10 = "textB5"
</item>
<list selected_text>
/ selectionmode = list.selected_pic.currentindex // pair to pic list
</list>
<text text>
/ items = text_all
/ position = (50, 55)
/ select = list.selected_text.nextvalue
</text>
<list selected_textA>
/ items = (1-5)
/ selectionrate = always
</list>
<list selected_textB>
/ items = (6-10)
/ selectionrate = always
</list>

<trial trial>
/ stimulusframes = [1 = pic, text]
/ timeout = 1000
</trial>

<block block>
/ onblockbegin = [
    var i = 0;
    while (i < 3) {
        list.selected_pic.appendItem(list.selected_picA.nextValue); // pick random pic from category A
        list.selected_text.appendItem(list.selected_textA.nextValue); // pick random text from category A
        i += 1;
    };
    i = 0;
    while (i < 3) {
        list.selected_pic.appendItem(list.selected_picB.nextValue); // pick random pic from category B
        list.selected_text.appendItem(list.selected_textB.nextValue); // pick random text from category B
        i += 1;
    };
]
/ trials = [1-12 = trial]
</block>[/code]

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list selection based on criteria

RE: list selection based on criteria