+xHello,
I have a question regarding the order of the blocks. With seven blocks, blocks 1, 2, and 5 are practice and a person just has either attributes or targets to match it to the proper category. The blocks 3&4 can be either compatible or incompatible, same with 6&7.
My question is: does the order matter? Does it matter what blocks go first? Compatible or incompatible?
I have only found information that for some subjects blocks 1, 3 & 4 are switched with blocks 5, 6 & & (Greenwald, Nosek, and Banaji, 2003). It is done so to reduce the effect of order. My question is: do I do that manually? Or does the program do it on its own?
If it has to be done manually, is there any research regarding the effect of order in the IAT? I was trying to find something but unfortunately, I haven't found anything.
I will be forever grateful for some answers!!
Block order in the IAT scripts is counterbalanced between subjects.
Odd group numbers receive compatible first,
<expt>
/ preinstructions = (iatintro)
/subjects = (1 of 2)
/groupassignment = groupnumber
/ blocks = [
1=targetcompatiblepractice;
2=attributepractice;
3=compatibletest1;
4=compatibletestinstructions;
5=compatibletest2;
6=targetincompatiblepractice;
7=incompatibletest1;
8=incompatibletestinstructions;
9=incompatibletest2;
10=summary;
]
/onexptend = [values.completed = 1]
</expt>
even group numbers receive incompatible first:
<expt>
/ preinstructions = (iatintro)
/subjects = (2 of 2)
/groupassignment = groupnumber
/ blocks = [
1=targetincompatiblepractice;
2=attributepractice;
3=incompatibletest1;
4=incompatibletestinstructions;
5=incompatibletest2;
6=targetcompatiblepractice;
7=compatibletest1;
8=compatibletestinstructions;
9=compatibletest2;
10=summary;
]
/onexptend = [values.completed = 1]
</expt>
Order effects have been investigated, see e.g.
https://faculty.washington.edu/agg/IATmaterials/PDFs/NGB2005.PSPB.pdf (you should read the entire "Understanding and Using the Implicit Association Test" series of articles).