initialize picture issue


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wsly
wsly
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Hi!
I am testing my <batch> sequence before uploading it on to the web. I have an issue with the script attached: after some trials it crashes saying <unable to initialize picture probe number 0>.
Could someone be so kind to tell me what I did wrong? It would be much appreciated!!

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VISUAL WORKING MEMORY 2016.iqx (489 views, 44.00 KB)
Dave
Dave
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> after some trials it crashes saying  <unable to initialize picture probe number 0>.

You use a values entry to select the item in <picture probe>

<picture probe>
/items = stims
/select = values.probestim
/position = (50%, 50%)
/size = (30%, 30%)
</picture>

What the error means is that at the point it occurs values.probestim is null or equal to zero. Neither is a valid item number and there is no such thing as a "zero-th" image file. You need to make sure that values.probestim (as well as all the other values you use for item selection) are always set to a valid item number.

For example, in <trial negativeprobe> you try to set values.probestim to an item number pulled from a <list>

<trial negativeprobe>
/inputdevice = keyboard
/ontrialbegin = [values.probestim = list.negativeprobes.nextvalue]
/stimulusframes = [1 = probe, in, out]
...
</trial>

That <list>, however, does not actually hold any items / item numbers at all. Hence, values.probestim will be set to null.

<list negativeprobes>
/replace = false
/ selectionrate = always
</list>

Run this short example to see what happens:

<values>
/ probestim = 1
</values>

<block myblock>
/ trials = [1=a; 2=b]
</block>

<trial a>
/ stimulusframes = [1=mytext]
/ validresponse = (57)
</trial>

<trial b>
/ ontrialbegin = [values.probestim = list.negativeprobes.nextvalue; ]
/ stimulusframes = [1=mytext]
/ validresponse = (57)
</trial>

<text mytext>
/ items = ("values.probestim is equal to <%values.probestim%>")
</text>

<list negativeprobes>
/replace = false
/ selectionrate = always
</list>

Edited 4 Years Ago by Dave
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