By charlottebooth - 1/19/2015
Hello,
I want to make the inter-trial interval vary between 500ms and 1000ms. At the moment I have:
<defaults>
/ posttrialpause = 500
</defaults>
And <defaults>
/posttrialpause = 500-1000
Does not work.
Is there a different symbol to use?
Many thanks,
Charlotte
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By Dave - 1/19/2015
That's not how the /posttrialpause attribute works. To have a random ITI you ought to do something along the lines of:
<expressions>
/ randomiti = round(rand(500,1000))
</expressions>
<trial mytrial>
/ posttrialpause = expressions.randomiti
/ stimulusframes = [1=mytext]
/ validresponse = (57)
</trial>
<text mytext>
/ items = ("Press the spacebar.")
</text>
<block myblock>
/ trials = [1-10=mytrial]
</block>
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