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Gabriel Ponte	Gabriel Ponte posted 11 Years Ago Topic Details Share Topic
Group: Awaiting Activation Posts: 2, Visits: 2	Hi, I read, that the IAT effect is the difference between the second block ("compatible condition") and the fifth block ("incompatible condition"). Is it possible to show this effect in the data or do I have to compute each reaction time (for every single reaction) manually. That would be a gigantic load of work. Please clarify this issue, if you can. thanks, Gabriel
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Dave	Dave posted 11 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 108K	> I read, that the IAT effect is the difference between the second block ("compatible condition") and the fifth block ("incompatible condition") As stated, this is incorrect. You may want to re-read Greenwald, Nosek & Banaji, 2003 for details. > Is it possible to show this effect in the data or do I have to compute each reaction time (for every single reaction) manually. > That would be a gigantic load of work Why would you have to compute something for each reaction time for every single reaction? I have a feeling there may be some profound misconception re. what the IAT's D-score is / represents. In essence, it is a difference score (scaled difference between mean reaction times in two conditions -- "incompatible mean rt" - "compatible mean rt") and is as such very much akin to Cohen's d effect size measure. Moreover, all the IAT scripts made available via the Task Library at millisecond.com automatically compute D-scores and record them in the data file. See https://www.millisecond.com/forums/Topic3444.aspx.
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