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CHILD FLANKER TEST-with Norwegian instructions
Script Author: Katja Borchert, Ph.D. (email@example.com) for Millisecond Software, LLC
last updated: 08-03-2015 by K.Borchert for Millisecond Software LLC
Copyright © 08-03-2015 Millisecond Software
This script implements a basic Flanker Test for children as described in:
Christ, S.E., Kester, L.E., Bodner, K.E. & Miles, J.H. (2011). Evidence for Selective Inhibitory Impairment in Individuals
With Autism Spectrum Disorder. Neuropsychology, 25, 690–701.
Participants are presented 5 fish in one row and are instructed to pay attention to the center fish (target).
If the center fish looks to the right, participants are instructed to press a specific response key.
If the center fish looks to the left, participants are instructed to press a different response key.
The fish flanking the middle fish (the flankers) can either look in the same (compatible) or the
opposite direction (incompatible) than the target/center fish (Note: the flanker fish always look in the same direction).
DATA FILE INFORMATION:
The default data stored in the data files are:
(1) Raw data file: 'ChildFlankerFish_raw*.iqdat' (a separate file for each participant)
build: Inquisit build
date, time, subject: date and time script was run with the current subjectnumber
blockcode, blocknum: the name and number of the current block
trialcode, trialnum: the name and number of the currently recorded trial
(Note: not all trials that are run might record data)
/trialtype: 1 = congruent, target fish to the right
2 = incongruent, target fish to the right
3 = congruent, target fish to the left
4 = incongruent, target fish to the left
/congruence: stores the congruence of the target and flankers (congruent vs incongruent)
/targetdirection: stores the direction of the target fish (targetleft vs targetright)
stimulusitem: the presented stimuli in order of trial presentation
response: the participant's response (scancode)
/response: stores the response category depending on latency and response key used ("anticipatory", "valid", "too slow", "wrong response")
correct: the correctness of the response
latency: the response latency in ms
(2) Summary data file: 'ChildFlankerFish_summary*.iqdat' (a separate file for each participant)
script.startdate: date script was run
script.starttime: time script was started
script.subjectid: subject id number
script.groupid: group id number
script.elapsedtime: time it took to run script (in ms)
/completed: 0 = script was not completed; 1 = script was completed (all conditions run)
/percenterrors_c: percent errors in congruent trials (test only)
/percenterrors_i: percent errors in incongruent trials (test only)
/meanRT_cc: mean latency of correct responses in congruent trials (in ms)
/meanRT_ci: mean latency of correct responses in incongruent trials (in ms)
2 congruence (congruent vs incongruent) x 2 target directions (right vs left) tested within participants
1. Practice Block: 20 trials with only targets (10 left, 10 right, randomly sampled)
2. Practice Block: 20 trials with targets and flankers (5 congruent_left, 5 congruent_right, 5 incongruent_right, 5 incongruent_left,
3. Test Block: 120 trials with targets and flankers (all 4 conditions equally often, randomly sampled)
=> number of trials can be edited under EDITABLE CODE -> Editable Values
1. trial.flanker: trialduration max. 3000ms (default, editable)
-> trial terminates immediately after a given response or after max trialduration.
!!Note: to adjust the size of the 5 fish on your monitor, go to EDITABLE CODE -> Editable Values and edit
parameters.pictureheight and/or parameters.flankerdistance
2. (trial.errorfeedback): if errors occurred; error trialduration editable
a) Anticipatory response: responses faster than parameters.anticipatoryresponselatency (default: 200ms, editable value)
b) Too slow: no response occuring before parameters.max_trialduration (default: 3000ms = max trialduration of trial.flanker, editable value)
c) Wrong Response: incorrect response key was pressed
Error feedback is presented in a visual (text that specifies the specific error) and auditory form (sound file).
3. trial.iti: trialduration 1500ms (default, editable)
4. (trial.rest): if number of trials indicate that a rest trial should be presented (default: after 40 trials, editable)
Fish stimuli are used from the ChildANT.iqx script (the fish were originally downloaded from:
Instructions are not original. They can easily be edited under EDITABLE CODE -> Editable Instructions
Instructions are provided in Norwegian.
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_targetright: scancode of the response key for target fish that look to the right (default: 52)
/responsekeytargetright_label: description of the response key for target fish that look to the right
/responsekey_targetleft: scancode of the response key for target fish that look to the left (default: 51)
/responsekeytargetleft_label: description of the response key for target fish that look to the left
/pictureheight: determines the size/height in screen height % of the individual fish pictures (default: 10%)
/flankerdistance: determines the distance in screen width % between flankers (default: 10%)
Note: change these parameters to optimize the fish presentation on your screen
/errorfeedbackheight: determines the height of the feedback text in screen height (default: 5%)
/numberofpracticetrials: determines the number of practice trials in each practice blocks (default: 20)
/numberoftrials: determines the number of test trials (default: 160)
Note: list.trialtype controls the distribution of congruent/incongruent trials
by default, the same number of congruent right, incongruent right, congruent left, incongruent left
trials are run.
/resttrial: determines the number of trials after which a rest trial is presented
/max_trialduration: the maximum trial duration of the flanker presentation in ms (default: 3000ms)
/iti: the duration of the intertrial interval in ms- time between response and next presentation
OR time between offset of errorfeedback and next presentation (default: 1500ms)
/errorfeedbackduration: duration of error feedback in ms (default: 1000ms)
/restduration: duration of rest trial in ms(default: 60000ms)
/anticipatoryresponselatency: all response latencies (in ms) lower than this value will be categorized as "anticipatory responses" (default: 200ms)