___________________________________________________________________________________________________________________ AFFECT MISATTRIBUTION PROCEDURE (AMP) ___________________________________________________________________________________________________________________ last updated: 02-16-2022 by K. Borchert (katjab@millisecond.com) for Millisecond Software, LLC Script Copyright © 02-16-2022 Millisecond Software ___________________________________________________________________________________________________________________ BACKGROUND INFO ___________________________________________________________________________________________________________________ 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. ___________________________________________________________________________________________________________________ TASK DESCRIPTION ___________________________________________________________________________________________________________________ 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. ___________________________________________________________________________________________________________________ DURATION ___________________________________________________________________________________________________________________ the default set-up of the script takes appr. 3 minutes to complete ___________________________________________________________________________________________________________________ DATA FILE INFORMATION ___________________________________________________________________________________________________________________ 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 session: 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) inquisit.version: Inquisit version run computer.platform: the platform the script was run on (win/mac/ios/android) startDate: date script was run startTime: time script was started subjectid: assigned subject id number groupid: assigned group id number sessionid: assigned session id number elapsedTime: time it took to run script (in ms); measured from onset to offset of 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) ___________________________________________________________________________________________________________________ EXPERIMENTAL SET-UP ___________________________________________________________________________________________________________________ * 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 ___________________________________________________________________________________________________________________ STIMULI ___________________________________________________________________________________________________________________ see section Editable Stimuli ___________________________________________________________________________________________________________________ INSTRUCTIONS ___________________________________________________________________________________________________________________ see section Editable Instructions ___________________________________________________________________________________________________________________ EDITABLE CODE ___________________________________________________________________________________________________________________ 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)