Last Modified: January 18, 2025 by K. Borchert (katjab@millisecond.com), Millisecond
Script Copyright © Millisecond Software, LLC
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 the attitudes they have 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.
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.
3 minutes
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.
• 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
see section Editable Stimuli
see section Editable Instructions
File Name: amp_summary*.iqdat
| Name | Description |
|---|---|
| inquisit.version | Inquisit version number |
| computer.platform | Device platform: win | mac |ios | android |
| computer.touch | 0 = device has no touchscreen capabilities; 1 = device has touchscreen capabilities |
| computer.hasKeyboard | 0 = no external keyboard detected; 1 = external keyboard detected |
| 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 = Test was not completed 1 = Test was completed |
| 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) |
File Name: amp_raw*.iqdat
| Name | Description |
|---|---|
| build | Inquisit version number |
| computer.platform | Device platform: win | mac |ios | android |
| computer.touch | 0 = device has no touchscreen capabilities; 1 = device has touchscreen capabilities |
| computer.hasKeyboard | 0 = no external keyboard detected; 1 = external keyboard detected |
| date | Date the session was run |
| time | Time the session was run |
| subject | Participant ID |
| group | Group number |
| session | Session number |
| blockcode | The name the current block (built-in Inquisit variable) |
| blocknum | The number of the current block (built-in Inquisit variable) |
| trialcode | The name of the currently recorded trial (built-in Inquisit variable) |
| trialnum | The number of the currently recorded trial (built-in Inquisit variable) trialnum is a built-in Inquisit variable; it counts all trials run even those that do not store data to the data file. |
| primestim | Stores the itemnumber of the current prime stimulus |
| targetstim | Stores the itemnumber of the current target stimulus |
| response | Scancode of the response button pressed (spacebar = 57) |
| responseText | Label of response key pressed |
| 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) |
The procedure can be adjusted by setting the following parameters.
| Name | Description | Default |
|---|---|---|
| primeDuration | The duration (in ms) of the prime | 75 |
| primeTargetISI | The interstimulus interval (in ms) btw. offset of prime and onset of target the ISI presents an empty screen | 125 |
| targetDuration | The target duration (in ms) | 100 |