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										ABCD ARROW FLANKER TEST - touchscreen input
										(written for smartphones)
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Script Author: Katja Borchert, Ph.D. (katjab@millisecond.com) for Millisecond Software, LLC
Date: 03-28-2018
last updated:  07-27-2020 by K. Borchert (katjab@millisecond.com) for Millisecond Software, LLC

Script Copyright © 07-27-2020 Millisecond Software

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BACKGROUND INFO 	
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This script implements an short arrow version of the Flanker Test,
an inhibition test to assess the ability to suppress inappropriate dominant responses
evoked by task irrelevant information. The script was written for use on smart phones.

The implemented version is generously shared by the ABCD Consortium.

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TASK DESCRIPTION	
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Participants see 5 arrows in the middle of the screen inside a box. They have to decide whether the central arrow 
points right or left. The surrounding arrows (=flankers) either point in the same direction (congruent trials)
or in the opposite direction (incongruent trials). 

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DURATION 
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the default set-up of the script takes appr. 3 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: 'abcdarrowflankertest_touchscreen_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.practice:					0 = test block; 1 = practice block										
values.blockcount:					counts the test blocks run										
values.countPracticeBlocks:			counts the number of practice runs									
values.trialcount:					counts all trials per block

values.congruence:					determines the state of the flankers 
									1 = congruent (target and flanker point in the same direction), 
									2 = incongruent (target points in opposite direction)
									
values.selecttarget:				itemnumber of the current target (center) stimulus
									1 = target points to right; 
									2 = target points to left
										
values.selectflanker:				itemnumber of the current flanker stimuli
response:							the participant's response (leftresponsebutton, rightresponsebutton)
correct:							the correctness of the response (0 = error or no response; 1 = correct)
latency: 							the response latency (in ms); measured from onset of target to response (or trial timeout)

homeButton_RT:						the response time to press the homeButton during trial.homeBase

list.ACC_practice.mean:				the current proportion correct at this point in practice

values.practicePass:				1 = participant passed practice; 
									0 = participant did not pass practice									
									

(2) Summary data file: 'abcdshortarrowflankertest_touchscreen_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.blockcount:					number of test blocks run
values.countPracticeBlocks:			counts the number of practice runs		
list.ACC_practice.mean:				the proportion correct at the end of the last practice run

values.practicePass:				1 = participant passed practice; 
									0 = participant did not pass practice

expressions.TrialCount:					overall trial count									
expressions.propcorrect:				overall proportion correct (test trials only)				
expressions.meanrt:						overall mean latency (in ms) of correct responses (test trials only)
expressions.medianrt:					overall median latency (in ms) of correct responses (test trials only)

expressions.TrialCount_congruent:		congruent trial count
expressions.propcorrect_congruent:		proportion correct for all congruent trials
expressions.meanrt_congruent: 			mean latency (ms) of correct responses to congruent targets
expressions.medianrt_congruent:			median latency (ms) of correct responses to congruent targets

expressions.TrialCount_incongruent:		incongruent trial count
expressions.propcorrect_incongruent:	proportion correct for all incongruent trials
expressions.meanrt_incongruent: 		mean latency (ms) of correct responses to incongruent targets
expressions.medianrt_incongruent:		median latency (ms) of correct responses to incongruent targets
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EXPERIMENTAL SET-UP 
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2 flanker congruence (congruent vs. incongruent), tested within

1-3 Practice Blocks: each block runs 4 trials with errorfeedback (number of trials can be edited under section Editable Parameters)
- participants have to get 75% correct to move on to the test block (proportion correct editable under section Editable Parameters)
- after 3 failed practice runs, all participants move on to the test
- trial order is fixed; fixation star duration = 1250ms for each trial

1 Test Block: runs 20 trials in fixed sequence

Trial Sequence:
homeBase (waits for finger to press homeBase)
-> presents fixation star for values.fixationDuration (1000, 1250, 1500ms)
-> presents 'middle' text reminder (default: 100ms)
-> presents flankers (default: 100ms)
-> adds the target and waits for response 
Note: the selected response button is highlighted for 100ms
-> homeBase for 800ms (whether pressed or not)

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STIMULI
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stimuli: 5 arrows pointing right or left (flanker, flanker, target, flanker, flanker)
Arrows can be edited under section Editable Stimuli

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INSTRUCTIONS 
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Instructions are similar to the NIH toolbox Arrow Flanker Test.
Instruction text 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:

/targetDelay:							the delay (in ms) of the target relative to onset of flankers (default: 100ms)
/cueDuration:							the duration (in ms) of the cue 'middle' reminder (default: 1000ms)
/homeBaseReminder:						the delay (in ms) of the home base reminder if finger is not returned to home base (default: 2000ms)
																						
/iti:									the intertrial interval (in ms) (default: 800ms)											
											
/errorFeedbackDuration:					the duration (in ms) of error feedback during practice (default: 5000ms)
/correctFeedbackDuration:				the duration (in ms) of correct feedback during practice (default: 2000ms)


/minPracticeACC:						the minimum proportion correct during a practice run that moves participant to the test (default: 0.75)
/numberPracticeTrials:					the number of practice trials per practice run (default: 4)
											Note: needs to be divisible by 4
/maxPracticeRuns:						the maximum number of practice runs  (default: 3)
/numberTestTrials:						the number of test trials run (default: 20)
											Note: needs to be divisible by 4