Return to the Glocal Local Task with Mouse Input (Children) page
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Global Local Task for Children
(mouse/touchscreen version)
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Script Author: Katja Borchert, Ph.D. (katjab@millisecond.com) for Millisecond Software, LLC
Date: 05-17-2017
last updated: 09-22-2021 by K. Borchert (katjab@millisecond.com) for Millisecond Software, LLC
Script Copyright © 09-22-2021 Millisecond Software
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BACKGROUND INFO
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This script implements a child friendly Global-Local-Task; a test of perceptual processing of global
and local features of stimuli.
The implemented procedure is based on:
Sjöwall, D., Roth, L., Lindqvist, S., & Thorell, L. B. (2013). Multiple deficits in ADHD:
executive dysfunction, delay aversion, reaction time variability and emotional deficits.
Journal of Child Psychology and Psychiatry, 54, 619–627.
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TASK DESCRIPTION
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Participants see Navon figures made up of an overall shape (circle vs. square) and detail shapes (circle vs. square).
They work through 3 different rounds: (a) pay attention to global shape; (b) pay attention to local shape
(c) a mixed design (measures shifting).
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DURATION
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the default set-up of the script takes appr. 7 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: 'globallocaltask_children_mi_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.
countTrials: counts overall test trials (starttrial excluded from count)
task: stores the task from the current task: "global" vs. "local"
prevtask: stores the task from the previous task: "global" vs. "local"
globalForm: the global form of the current stim: "square" vs. "circle"
localForm: the local form of the current stim: "square" vs. "circle"
selectedStim: the itemnumber of the currently selected stimulus
stimulusitem: the selected image
response: the participant's response
responseCategory: "circle" vs. "square" (selected shape)
correct Response: the correct response for the current task: "square" vs. "circle"
correct: accuracy of response: 1 = correct response; 0 = otherwise
latency: the response latency (in ms); measured from: onset of stim
(2) Summary data file: 'globallocaltask_children_mi_summary*.iqdat' (a separate file for each participant)*
Computer Platform: the platform the script was run on (win/mac/ios/android)
Date: date script was run
Time: time script was started
Subject ID: assigned subject id number
Group ID: assigned group id number
Session ID: assigned session id number
Script Duration: time it took to run script (in ms); measured from onset to offset of script
Script Completion: 0 = script was not completed (prematurely aborted);
1 = script was completed (all conditions run)
ACC_global: proportion correct across all global test trials (block.global only)
meanRT_global: mean correct latency (in ms) of all global test trials (block.global only)
ACC_local: proportion correct across all local test trials (block.local only)
meanRT_local: mean correct latency (in ms) of all local test trials (block.local only)
ACC_shift: proportion correct of all mixed, shift trials (block.mixed only)
meanRT_shift: mean correct latency (in ms) of all mixed, shift trials (block.mixed only)
ACC_nonshift: proportion correct of all mixed, nonshift trials (block.mixed only)
meanRT_nonshift: mean correct latency (in ms) of all mixed, nonshift trials (block.mixed only)
shiftCost: estimates the shift cost by subtracting the mean correct latency on shift trials from those of nonshift trials
* 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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1. Block*: global task
- 10 practice trials (don't count toward summary statistics)
- 20 test trials (test trials are indistinguishable from practice trials)
- smiley feedback provided
- each of the two test stimuli is selected equally often during the test trials (order is randomized)
2. Block*: local task
- 10 practice trials (don't count toward summary statistics)
- 20 test trials (test trials are indistinguishable from practice trials)
- smiley feedback provided
- each of the two test stimuli is selected equally often during the test trials (order is randomized)
Note: order of global/local tasks is randomized.
3. Block: mixed (assesses shifting costs)
- 11 practice trials (1 starttrial + 10 shift/nonshift trials) - don't count toward summary statistics
- the starttrial selects the first task randomly
- 40 test trials: 20 shift + 20 nonshift trials (order is randomized)
- smiley feedback provided
- each of the two test stimuli is selected equally often during the test trials (order is randomized)
- the starttrials
Trial Sequence:
stimulus -> until response -> Feedback (500ms) -> ITI (500ms)
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STIMULI
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provided by Millisecond Software:
Sizing can be controlled via an editable parameter
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INSTRUCTIONS
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provided by Millisecond Software - can be edited under section Editable Instructions
The instructions are presented in slide format. Slides can easily be customized in PowerPoint.
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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:
/taskReminderDuration: duration of the reminder that reminds participants what to pay attention to for the global/local block (default: 2000ms)
/feedbackDuration: duration (in ms) of feedback smiley (default: 500ms)
/ITI: intertrial interval (in ms) (default: 500ms)
/readyDuration: duration (in ms) of the 'get ready' trial (default: 5000ms)
/stimSize: sizing of the stims proportional to the canvas height (default: 50%)