University of Padova

The Implicit Association Test

IAT structure

Block Function Left response key Right response key
1 Practice flowers insects
2 Practice good bad
3 Associative practice flowers & good insects & bad
4 Associative test flowers & good insects & bad
5 Practice insects flowers
6 Associative practice insects & good flowers & bad
7 Associative test insects & good flowers & bad

The D-score

D-score core procedure

\(D_{practice} = \frac{M_{b6} - M_{b3}}{sd_{b6,b3}}\)

\(D_{test} = \frac{M_{b7} - M_{b4}}{sd_{b7,b4}}\)

\(D_{score} = \frac{D_{practice} + D_{test}}{2}\)

D-score algorithms

Dscore Error inflation Lower tail treatment
D1 Built-in correction No
D2 Built-in correction delete trials < 400 ms
D3 Replace errors: mean (correct responses) + 2sd No
D4 Replace errors: mean (correct responses) + 600 ms No
D5 Replace errors: mean (correct responses) + 2sd delete trials < 400 ms
D6 Replace errors: mean (correct responses) + 600 ms delete trials < 400 ms
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Available options

Open source Programming skills Multiple Scores Plot
SPSS NO YES YES NO
Inquisit NO NO NO NO
IATanalytics YES YES Not clear NO
IATScore YES YES Not clear NO
IAT YES YES YES YES
IATScores YES YES YES YES
Something Open Source, user-friendly, able to compute multiple scores

DscoreApp

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