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Understanding and Using the Implicit Association Test



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ATTITUDES AND SOCIAL COGNITION Understanding and Using the Implicit Association Test I An Improved Scoring Algorithm Anthony G Greenwald Brian A Nosek University of Washington University of Virginia Mahzarin R Banaji Harvard University In reporting Implicit Association Test IAT results researchers have most often used scoring conventions described in the first publication of the IAT A G Greenwald D E McGhee J L K Schwartz 1998 Demonstration IATs available on the Internet have produced large data sets that were used in the current article to evaluate alternative scoring procedures Candidate new algorithms were examined in terms of their a correlations with parallel self report measures b resistance to an artifact associated with speed of responding c internal consistency d sensitivity to known influences on IAT measures and e resistance to known procedural influences The best performing measure incorporates data from the IAT s practice trials uses a metric that is calibrated by each respondent s latency variability and includes a latency penalty for errors This new algorithm strongly outperforms the earlier conventional procedure 2001 Egloff Schmukle 2002 Kim Greenwald 1998 its lack of dependence on introspective access to the association strengths being measured Greenwald et al 2002 and its ease of adaptation to assess a broad variety of socially significant associations see overview in Greenwald Nosek 2001 The IAT s measure often referred to as the IAT effect is based on latencies for two tasks that differ in instructions for using two response keys to classify four categories of stimuli Table 1 describes the seven steps blocks of a typical IAT procedure The first IAT publication Greenwald McGhee Schwartz 1998 introduced a scoring procedure that has been used in the majority of subsequently published studies The features of this conventional algorithm see Table 4 later in the article include a dropping the first two trials of test trial blocks for the IAT s two



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