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AFFECT MISATTRIBUTION PROCEDURE (AMP)
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last updated: 11-07-2019 by K. Borchert (katjab@millisecond.com) for Millisecond Software, LLC
Script Copyright © 11-07-2019 Millisecond Software
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BACKGROUND INFO
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This script implements the Affect Misattribution Procedure (AMP), a priming procedure using supraliminal primes
to assess implicit attitudes.
The rationale of the AMP is that people, despite instructions to the contrary, cannot ignore (supraliminal)
primes and will automatically attribute their attitudes towards the prime (category) to stimuli presented after.
The script implements a simple procedure to measure implicit attitudes towards flowers and insects (used as the primes).
It is designed to be easily adaptable to other target categories. Target categories can be edited under
section "Editable Stimuli" below.
Reference:
Payne, B.K., Cheng, C.M., OGovorun, O., and Stewart, B.D. (2005). An Inkblot for Attitudes:
Affect Misattribution as Implicit Measurement. Journal of Personality and Social Psychology,
Vol. 89, No. 3, 277–293.
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TASK DESCRIPTION
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Participants see brief flashes of pictures of flowers and insects (and a neutral stimulus)
followed by Chinese characters and are asked to judge the pleasantness of each Chinese character
as "pleasant" or "unpleasant" as fast as possible.
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DURATION
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the default set-up of the script takes appr. 3 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: 'amp_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
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. Thus, trialnum
may not reflect the number of main trials run per block.
values.primestim: stores the itemnumber of the current prime stimulus
values.targetstim: stores the itemnumber of the current target stimulus
response: scancode of the response button pressed:
18 = E = Unpleasant
23 = I = Pleasant
57 = space
correct: stores the correctness of the response (1 = correct; 0 = incorrect)
correctness in this script: pressed the response key that corresponds to the prime
latency: response latency (in ms); in this script: measured from onset of target
trial.primeA.totalpercentcorrect: the percent correct for primeA (flowers) across all test blocks (here: 1 test block)
correct = participant pressed the response key that corresponds to the prime (here: pressed pleasant for trials with flowers)
trial.primeB.totalpercentcorrect: the percent correct for primeB (insects) across all test blocks (here: 1 test block)
correct = participant pressed the response key that corresponds to the prime (here: pressed unpleasant for trials with insects)
trial.primeNeutral.totalpercentcorrect: the percent correct for primeNeutral across all test blocks (here: 1 test block)
correct = participant pressed the response key that corresponds to the prime (here: either response keys)
(2) Summary data file: 'amp_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)
trial.primeA.totalpercentcorrect: the percent correct for primeA (flowers) across all test blocks (here: 1 test block)
correct = participant pressed the response key that corresponds to the prime (here: pressed pleasant for trials with flowers)
trial.primeB.totalpercentcorrect: the percent correct for primeB (insects) across all test blocks (here: 1 test block)
correct = participant pressed the response key that corresponds to the prime (here: pressed unpleasant for trials with insects)
trial.primeNeutral.totalpercentcorrect: the percent correct for primeNeutral across all test blocks (here: 1 test block)
correct = participant pressed the response key that corresponds to the prime (here: either response keys)
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EXPERIMENTAL SET-UP
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* 1 Practice block of 10 trials randomly selecting from flowers/insects/neutral
* 1 Test block of 48 trials randomly selecting from flowers/insects/neutral
Trials:
* prime is presented for 75ms
* prime is replaced by a blank stimulus for 125ms
* the target is presented for 100ms and then covered up by a mask
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STIMULI
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see section Editable Stimuli
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INSTRUCTIONS
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see section Editable Instructions
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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:
/primeDuration: the duration (in ms) of the prime (default: 75ms)
/primeTarget_ISI: the interstimulus interval (in ms) btw. offset of prime and onset of target (default: 125ms)
Note: the ISI presents an empty screen
/targetDuration: the target duration (in ms) (default: 100ms)