Return to the Food Go/No Go Task page
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FOOD GO-NOGO TASK
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Script Author: Katja Borchert, Ph.D. (katjab@millisecond.com) for Millisecond Software, LLC
Date: 02-21-2017
last updated: 08-20-2021 by K. Borchert (katjab@millisecond.com) for Millisecond Software, LLC
Script Copyright © 08-20-2021 Millisecond Software
Millisecond Software thanks Dr. John Gunstad for his help with this script!
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BACKGROUND INFO
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Go/Nogo Tasks are used as behavioral measures of inhibition and cognitive control. The Food Go/No Tasks leverages
this paradigm to investigate cognitive control in the context of food.
Teslovich, T. et al (2014). Probing behavioral responses to food: Development of a foodspecific
go/no-go task. Psychiatry Res, 30, 219(1): 166–170.
E-prime script available at:
http://fablab.yale.edu/page/assays-tools
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TASK DESCRIPTION
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Go-Nogo task: general task is to press the spacebar whenever an stimuli of the Go category (e.g. food images)
is presented and refrain from responding whenever a stimuli of the NoGo category (e.g. toys) is presented.
In this script, participants work through 4 conditions:
(1) high-calorie food “go” with toy “no-go”
(2) low-calorie food “go” with toy “no-go”
(3) toy “go” with high-calorie food “no-go”
(4) toy “go” with low-calorie food “no-go”
Each condition runs ~75% go trials (35) and ~25% (13) nogo trials.
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DURATION
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the default set-up of the script takes appr. 20 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: 'foodgonogo_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.order: the order in which the four test blocks were run
values.calorieType: "high" vs. "low" vs. "ctrl"
values.goType: "go" vs. "nogo"
values.ITI: current intertrial interval in ms
values.stim: stores the currently presented target picture
response: the participant's response (scancode of response button)
Spacebar: 57
no response: 0
correct: the correctness of the response (1 = correct; 0 = otherwise)
latency: the response latency (in ms); measured from onset of image until response is registered
(2) Summary data file: 'foodgonogo_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)
values.order: the order in which the four test blocks were run
expressions.propCorrect: overall proportion correct across all trials
expressions.meanRT: mean correct reaction times across all GO trials
expressions.SD: standard deviation of correct reaction times in GO trials
expressions.maxRT: reaction time that is 3 standard deviations slower than the overall mean
expressions.minRT: reaction time that is 3 standard deviations faster than the overall mean
expressions.omissionFOOD: miss rate in food (across low and high calorie food) GO trials (should have responded to food but did not)
expressions.commissionFOOD: false alarm rate in food (across low and high calorie food) NOGO trials (should NOT have responded to food but did)
Note: => the higher the commission rate, the lower cognitive control in the face of food stimuli
(aka cannot refrain from responding)
expressions.meanRT_FOOD_orig: mean hit reaction time (in ms) in food GO trials (no outliers removed)
expressions.meanRT_FOOD_cleaned: mean hit reaction time (in ms) in food GO trials (outliers removed*)
expressions.omissionHC: miss rate in high calorie GO trials (should have responded to high calorie food but did not)
expressions.commissionHC: false alarm rate in high calorie NOGO trials (should NOT have responded to high calorie food but did)
Note: => the higher the commission rate, the lower cognitive control in the face of high calorie
food stimuli (aka cannot refrain from responding)
expressions.meanRT_HC_orig: mean hit reaction time (in ms) in HC GO trials (no outliers removed)
expressions.meanRT_HC_cleaned: mean hit reaction time (in ms) in HC GO trials (outliers removed*)
expressions.omissionLC: miss rate in low calorie GO trials (should have responded to low calorie food but did not)
expressions.commissionLC: false alarm rate in low calorie NOGO trials (should NOT have responded to low calorie food butdid)
Note: => the higher the commission rate, the lower cognitive control in the face of low calorie
food stimuli (aka cannot refrain from responding)
expressions.meanRT_LC_orig: mean hit reaction time (in ms) in LC GO trials (no outliers removed)
expressions.meanRT_LC_cleaned: mean hit reaction time (in ms) in LC GO trials (outliers removed*)
expressions.omissionCTRL: miss rate in CTRL GO trials (should have responded to CTRL stim but did not)
expressions.commissionCTRL: false alarm rate in CTRL NOGO trials (should NOT have responded to CTRL stim but did)
expressions.meanRT_CTRL_orig: mean hit reaction time (in ms) in CTRL GO trials (no outliers removed)
expressions.meanRT_CTRL_cleaned: mean hit reaction time (in ms) in CTRL GO trials (outliers removed*)
expressions.omission_CTRL_HC: miss rate in CTRL_HC GO trials (should have responded to CTRL_HC stim but did not)
expressions.commission_CTRL_HC: false alarm rate in CTRL_HC NOGO trials (should NOT have responded to CTRL_HC stim but did)
expressions.meanRT_CTRL_HC_orig: mean hit reaction time (in ms) in CTRL_HC GO trials (no outliers removed)
expressions.meanRT_CTRL_HC_cleaned: mean hit reaction time (in ms) in CTRL_HC GO trials (outliers removed*)
expressions.omission_CTRL_LC: miss rate in CTRL_LC GO trials (should have responded to CTRL_LC stim but did not)
expressions.commission_CTRL_LC: false alarm rate in CTRL_LC NOGO trials (should NOT have responded to CTRL_LC stim but did)
expressions.meanRT_CTRL_LC_orig: mean hit reaction time (in ms) in CTRL_LC GO trials (no outliers removed)
expressions.meanRT_CTRL_LC_cleaned: mean hit reaction time (in ms) in CTRL_LC GO trials (outliers removed*)
* separate data files: to change to one data file for all participants (on Inquisit Lab only), go to section
"DATA" and follow further instructions
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EXPERIMENTAL SET-UP
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(I) Practice:
~3min practice session with a) Food (high and low calorie) Go / Toy Nogo and b) Food Nogo / Toys Go
Total practice trials: 22; trial/stimuli order fixed (see http://fablab.yale.edu/page/assays-tools)
(II) Test:
4 conditions tested:
(1) high-calorie food “go” with toy “no-go” (block.highGO, 48 trials: 35 go trials, 13 nogo trials)
(2) low-calorie food “go” with toy “no-go”, (block.lowGO)
(3) toy “go” with high-calorie food “no-go”, (block.highNOGO)
(4) toy “go” with low-calorie food “no-go”, (block.lowNOGO)
tested within participants in a blocked format. The order of the 4 conditions were counterbalanced
by groupnumbers (4 orders, see section EXPERIMENT).
Each block runs 35 go trials and 13 nogo trials (= 4 x 48 test trials = 192 test trials total)
By default all blocks run trials/stimuli in a fixed order. Orders taken from:
http://fablab.yale.edu/page/assays-tools
To run the trials/stimuli in random order, go to section Editable Lists and follow further instructions.
Default Trial Timings:
Fixation Cross (ITI duration: either fixed or random*) -> Target Image (500ms) -> Fixation Cross until response or up to 2000ms (End of Trial)
* if parameters.runRandomITI is set to false, a fixed ITI is run. Default is: 2500ms (can be set under section Editable Parameters).
Random ITIs are controlled by list.intertrialIntervals under section Editable Lists.
**Each block starts with a trial that presents the fixation cross in red for 500ms
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STIMULI
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Stimuli used provided by:
http://fablab.yale.edu/page/assays-tools
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INSTRUCTIONS
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instructions modelled after instructions used by:
http://fablab.yale.edu/page/assays-tools
all instructions can be edited under 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:
/responseKey: go-responsekey scancode (default: " " -> spacebar)
/fixationSize: the size of the fixation cross in proportion to canvas height (default: 8%)
/picSize: the proportional size of the pictures (default: 60%)
/pictureDuration: the duration (in ms) that the images are on screen (default: 500ms)
/RW: the duration (in ms) of the response window; measured from onset of target image (default: 2500ms)
/runRandomITI: true (1): a random ITI is selected from list.intertrialIntervals
false (2): a fixed ITI is selected (see parameters.fixedITI)
/fixedITI: the fixed intertrial interval (in ms) if parameters.runRandomITI = false (default: 2500ms)