Last Modified: January 17, 2023 by K. Borchert (katjab@millisecond.com), Millisecond
Script Copyright © Millisecond Software, LLC
This script implements a blocked Food Stroop by Millisecond. The classic Stroop paradigm demonstrates the interference of word meaning on naming the color in which the words are written as measured by reaction time/accuracy differences to color-meaning congruent and color-meaning incongruent combinations. The Food Stroop takes advantage of this basic Stroop interference effect by comparing responses to food related words to color and neutral animal words.
8 minutes
Participants get words of 6 different conditions (e.g. unhealthy and healthy foods, animal names, and color words) in 5 different colors and are asked to name the color of the word as fast as possible.
1 Practice Block: 5 trials with "GREEN", "RED", "CAT", "BANANA", "MILKSHAKE"
6 Test Blocks:
1) Congruent Color Words: presents 20 color words (red, blue, green, black, yellow) in the congruent color (4 repetitions of each color word with constraint that the same color cannot presented consecutively)
2) Incongruent Color Words: presents 20 color words (red, blue, green, black, yellow) in incongruent colors (4 repetitions of each color word; each time it is presented in a different incongruent color with constraint that the same color cannot presented consecutively)
3) unhealthy food choices: presents 20 unhealthy food choices in 5 colors (colors randomly selected with constraint that the same color cannot presented consecutively )
4) healthy food choices: presents 20 healthy food choices in 5 colors (colors randomly selected with constraint that the same color cannot presented consecutively )
5) animals (control for unhealthy food choices): presents 20 animals in 5 colors (colors randomly selected with constraint that the same color cannot presented consecutively)
6) animals (control for healthy food choices): presents 20 animals in 5 colors (colors randomly selected with constraint that the same color cannot presented consecutively)
• order of blocks is randomly selected
Trial Sequence:
Fixation Cross for 200ms -> Stim word until verbal response (recorded but not evaluated)
see section Editable Stimuli
see section Editable Instructions
File Name: foodstroop_withvoicerecording_summary*.iqdat
| Name | Description |
|---|---|
| inquisit.version | Inquisit version number |
| computer.platform | Device platform: win | mac |ios | android |
| startDate | Date the session was run |
| startTime | Time the session was run |
| subjectId | Participant ID |
| groupId | Group number |
| sessionId | Session number |
| elapsedTime | Session duration in ms |
| completed | 0 = Test was not completed 1 = Test was completed |
File Name: foodstroop_withvoicerecording_raw*.iqdat
| Name | Description |
|---|---|
| build | Inquisit version number |
| computer.platform | Device platform: win | mac |ios | android |
| date | Date the session was run |
| time | Time the session was run |
| subject | Participant ID |
| group | Group number |
| session | Session number |
| blockCode | Name of the current block |
| blockNum | Number of the current block |
| trialCode | Name of the current trial |
| trialNum | Number of the current trial |
| stimword | Contains the current stim word |
| stimcolor | Contains a numeric representation of the current word's display color 1=black, 2=blue, 3=green, 4=red, 5=yellow |
| condition | Contains a numeric representation of the current condition 1=congruent (color condition) 2=incongruent (color condition) 3=HPF (high calorie food) 4=NTF (low calorie food) 5=HPFA (animal comps for the high calorie food category), 6=NTFA (animal comps for the low calorie food category) |
| response | The participant's response (the voice record; needs to be manually scored) |
| latency | The response latency (in ms); measured from onset of word |