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Hello Sean,

We are generating a single target implicit association test. We would like to create one practice block and two test blocks. We managed to create the practice block so far. We took a template for the Single target IAT as developed by Wigboldus, Holland & van Knippenberg. Is it possible to work with 3 blocks instead of five? We would like to create a block where 5 positive words are presented twice, and 5 negative and 5 targetwords (both the same response key) once. In block 3 we would also like to create something like this, but then 5 negative words presented twice and 5 positive and 5 targetwords (both the samen response key) once.

Thank you in advance,

Eline & Lieke

Hi Eline and Lieke,

I'm not sure I fully understand what you are trying to do, but here are some pointers that will hopefully help:

To add and remove blocks, you should modify the /blocks command of the <expt> object. In the template, it looks like this:

<expt>
/ blocks = [1=attributepractice; 2=block1; 3=block3; 4=block4; 5=block5; 6=block6; 7=block7; 8=summary]
</expt>

where the actual block names are substituted according to the <variables> definition. Simply remove the blocks that you don't want.

To control how many stimuli are presented in a block, use the /trials command of the <block> element. In your example above, you could set the /trials as follows:

/ trials = [1=instructions; 2-21 = noreplace(positive, positive, negative, targets)]

By listing "positive" twice, it will be selected twice as frequently.

Hope this helps,

Sean

Hello Eline & Lieke,

well, obviously I'm not Sean, but I'd like to help anyway. The problem is, I'm not really sure, what exactly your problem is. The procedure described in your post can easily be implemented by adapting the Single Target IAT sample script available from the site. Delete the two blocks you don't want to be run (I suspect them to be "compatibletest2" and "incompatibletest2") and adjust the items to your needs. You might have to add additional itemsets for the positive and negative words (one containig the five words, another one containing these words twice, i.e. 10 words) to achieve the result you're looking for. So, if you could give me a more detailed description of the issues you're facing, I might be able to say something more constructive.

~Dave

P.S.: Ah, dammit. Sean was quicker... ;-)