IAT trials loop

gazzardlauren — Fri, 11 Aug 2017 17:21:19 GMT

Hi there,

Within a block we are trying to show a photo briefly and then do a response test, we would like to do this repetitively within a single block. Currently we have:

<block priming>
/ bgstim = (attributeAright, attributeBleft, targetcenter)
/ trials = [1=instructions;2=instructions;3=targetcenter;4=noreplace(attributeA, attributeB);5=targetcenter;6=noreplace(attributeA, attributeB)]
/ recorddata = false
</block>

We would like to do many iterations of "targetcenter" and "noreplace(attributeA, attributeB)" without having to progress through numbers.

Thank You,
Lauren Gazzard

RE: IAT trials loop

Dave — Fri, 11 Aug 2017 17:21:19 GMT

[quote]

[b]gazzardlauren - Friday, August 11, 2017[/b]

[/quote]

Not quite sure what you mean by "(without) having to progress through numbers," but you can reformulate to like so:

<block priming>
/ bgstim = (attributeAright, attributeBleft, targetcenter)
/ trials = [1=instructions;2=instructions;3,5,7,9,11=targetcenter;4,6,8,10,12=noreplace(attributeA, attributeB);]
/ recorddata = false
</block>

Otherwise, you need to employ a /branch from <trial targetcenter> to either trial.attributeA or trial.attribueB selected from a <list>. I.e. something like:

<block priming>
/ bgstim = (attributeAright, attributeBleft, targetcenter)
/ trials = [1=instructions;2=instructions;3-12=targetcenter]
/ recorddata = false
</block>

with

<trial targetcenter>
...
/ branch = [list.atrributetriallist.nextvalue]
</trial>

and

<list attributetriallist>
/ items = (trial.attributea, trial.attributeb)
/ poolsize = 10
</list>

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IAT trials loop

RE: IAT trials loop