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Power Implicit Association Test (IAT) - with pictures
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Main Inquisit programming: Sean Draine (seandr@millisecond.com)
last updated: 08-19-2021 by K. Borchert (katjab@millisecond.com) for Millisecond Software, LLC
Script Copyright © 08-19-2021 Millisecond Software
This script uses the general Inquisit IAT template with stimuli shared by Dr. Slabbinck
Millisecond Software thanks Dr. Slabbinck for sharing his materials!
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BACKGROUND INFO
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The Implicit Association Task (Greenwald, McGhee, & Schwartz, 1998) is a widely-used cognitive-behavioral paradigm
that measures the strength of automatic (implicit) associations between concepts in people’s minds relying
on latency measures in a simple sorting task.
The strength of an association between concepts is measured by the standardized mean difference score of
the 'hypothesis-inconsistent' pairings and 'hypothesis-consistent' pairings (d-score) (Greenwald, Nosek, & Banaji, 2003).
In general, the higher the d-score the stronger is the association between the 'hypothesis-consistent' pairings
(decided by researchers). Negative d-scores suggest a stronger association between the 'hypothesis-inconsistent' pairings.
D-scores obtained with this script:
Positive d-scores: support a stronger association between 'Power-Attractive' and 'Non Power-Attractive' than for the opposite pairings
Negative d-scores: support a stronger association between 'Non-Power-Attractive' and 'Power-Not Attractive' than for the opposite pairings
General IAT References:
Greenwald, A. G., McGhee, D. E., & Schwartz, J. K. L. (1998). Measuring individual differences in implicit cognition:
The Implicit Association Test. Journal of Personality and Social Psychology, 74, 1464-1480.
Greenwald, A. G., Nosek, B. A., & Banaji, M. R. (2003). Understanding and Using the Implicit Association Test:
I. An Improved Scoring Algorithm. Journal of Personality and Social Psychology, 85, 197-216.
Slabbinck, H., De Houwer, J., & Van Kenhove, P. (2011). A pictorial attitude IAT as a measure of implicit motives.
European Journal of Personality, 25(1), 76-86.
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TASK DESCRIPTION
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Participants are presented either adjectives or pictures (one by one) and are asked
to do a simple categorization task to categorize the items into categories like
"attractive OR Power" vs. "not attractive OR Non-Power" by pressing 2 different
keys on the keyboard.
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DURATION
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the default set-up of the script takes appr. 5.5 minutes to complete
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DATA FILE INFORMATION
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The default data stored in the data files are:
(1) Raw data file: 'poweriat_raw*.iqdat' (a separate file for each participant)
build: The specific Inquisit version used (the 'build') that was run
computer.platform: the platform the script was run on (win/mac/ios/android)
date, time, date and time script was run
subject, group, with the current subject/groupnumber
Note: odd/even groupnumbers balance the order in which
hypothesis-compatible/incompatible blocks are run
odd = compatible - incompatible
even = incompatible - compatible
script.sessionid: with the current session id
blockcode, blocknum: the name and number of the current block (built-in Inquisit variable)
trialcode, trialnum: the name and number of the currently recorded trial (built-in Inquisit variable)
Note: trialnum is a built-in Inquisit variable; it counts all trials run;
even those that do not store data to the data file such as feedback trials
conditionOrder: c-ic: consistent -> inconsistent
ic-c: inconsistent -> consistent
response: the response key pressed (e.g. 18=E or 23=I)
Note: script saves the final and -by design- correct response for each trial
correct: the accuracy of the initial response
0 = initial response was incorrect and needed to be corrected
1 = initial response is correct
latency: the latency of the final (correct) response in ms; measured from onset of stim
stimulusnumber: the number of the current stimulus
stimulusitem: the currently presented item
Only meaningful for the last row of data in the raw data file (upon completion of IAT):
expressions.da: d-score of the first short blocks
expressions.db: d-score of the second long blocks
expressions.d: overall d-score (non-weighted mean of the 2 d-scores); main DV
Suggested Interpretation:
D-score <= -0.65 => "a strong" preference for hypothesis-NONconforming pairings
D-score < -0.35 => "a moderate" preference for hypothesis-NONconforming pairings
D-score < -0.15 => "a slight" preference for hypothesis-NONforming pairings
-0.15 <= D-score <= 0.15 "little to no" preference
D-score > 0.15 => "a slight" preference for hypothesis-conforming pairings
D-score > 0.35 => "a moderate" preference for hypothesis-conforming pairings
D-score >= 0.65 => "a strong" preference for hypothesis-conforming pairings
expressions.percentcorrect: the overall percent correct score of initial responses in test trials of D-score qualifying latencies
expressions.propRT300: the proportion of response latencies < 300ms
expressions.excludeCriteriaMet: 1 = yes, exclusion supported per Greenwald et al (2003, p.214, Table 4):
More than 10% of all response latencies are faster than 300ms
0 = otherwise
(2) Summary data file: 'poweriat_summary*.iqdat' (a separate file for each participant)
computer.platform: the platform the script was run on (win/mac/ios/android)
script.startdate: date script was run
script.starttime: time script was started
script.subjectid: assigned subject id number
script.groupid: assigned group id number
script.sessionid: assigned session id number
script.elapsedtime: time it took to run script (in ms); measured from onset to offset of script
script.completed: 0 = script was not completed (prematurely aborted);
1 = script was completed (all conditions run)
conditionOrder: c-ic: consistent -> inconsistent
ic-c: inconsistent -> consistent
expressions.da: d-score of the first short blocks
expressions.db: d-score of the second long blocks
expressions.d: overall d-score (non-weighted mean of the 2 d-scores); main DV
Suggested Interpretation:
D-score <= -0.65 => "a strong" preference for hypothesis-NONconforming pairings
D-score < -0.35 => "a moderate" preference for hypothesis-NONconforming pairings
D-score < -0.15 => "a slight" preference for hypothesis-NONforming pairings
-0.15 <= D-score <= 0.15 "little to no" preference
D-score > 0.15 => "a slight" preference for hypothesis-conforming pairings
D-score > 0.35 => "a moderate" preference for hypothesis-conforming pairings
D-score >= 0.65 => "a strong" preference for hypothesis-conforming pairings
expressions.percentcorrect: the overall percent correct score of initial responses in test trials of D-score qualifying latencies
expressions.propRT300: the proportion of response latencies < 300ms
expressions.excludeCriteriaMet: 1 = yes, exclusion supported per Greenwald et al (2003, p.214, Table 4):
More than 10% of all response latencies are faster than 300ms
0 = otherwise
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EXPERIMENTAL SET-UP
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Hypothesis-consistent pairings vs. hypothesis-inconsistent pairings; tested within-subjects in a blocked format
=> order is counterbalanced by groupnumber assignment
odd groupnumbers run: consistent - inconconsistent pairings
even groupnumbers run: inconsistent - consistent pairings
Block Sequence:
1. Target Category sorting training
2. Attribute sorting training
3. 1. Test Block of hypothesis-consistent* pairings with 20 trials (half the participant start with inconsistent pairings)
4. 2. Test Block of hypothesis-consistent pairings with 40 trials
5. Target Category sorting training with targets switching sides
6. 1. Test Block of hypothesis-inconsistent pairings with 20 trials
7. 2. Test Block of hypothesis-inconsistent pairings with 40 trials
In all Test Blocks:
* attributes and targets alternate
* attributes as well as targets are randomly selected without replacement
Trial Sequence:
Target -> until correct response -> ISI: 250ms (default)-> Target....
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STIMULI
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Stimuli can be edited under section Editable Stimuli
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INSTRUCTIONS
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* start instruction page is provided as an html page. It automatically adapts to different images and category labels UNLESS
the number of attributes and/or targets have been changed. In this case, changes have to be
made to file "intro_iat.htm", so that the correct number of items are presented in the overview table.
Example: instead of 8 words for target A, only 5 should be presented:
in file "intro_iat.htm":
change:
| <%item.targetA.item(1)%>, <%item.targetA.item(2)%>, <%item.targetA.item(3)%>, <%item.targetA.item(4)%>,
<%item.targetA.item(5)%>, <%item.targetA.item(6)%>, <%item.targetA.item(7)%>, <%item.targetA.item(8)%>
|
To:
<%item.targetA.item(1)%>, <%item.targetA.item(2)%>, <%item.targetA.item(3)%>, <%item.targetA.item(4)%>,
<%item.targetA.item(5)%>
|
* item.instructions under section 'Editable Instructions' contains the the trial instructions
The instructions adapt automatically if different attributes and targets are used.
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EDITABLE CODE
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check below for (relatively) easily editable parameters, stimuli, instructions etc.
Keep in mind that you can use this script as a template and therefore always "mess" with the entire code
to further customize your experiment.
The parameters you can change are:
/showsummaryfeedback: set parameter showsummaryfeedback = true to display summary feedback to participants at the end (default)
set parameter showsummaryfeedback = false if no summary feedback should be presented to participants
/ISI: interstimulus interval (in ms) (default: 250ms)