___________________________________________________________________________________________________________________ ARROW FLANKER TEST - touchscreen input ___________________________________________________________________________________________________________________ Script Author: Katja Borchert, Ph.D. (katjab@millisecond.com) for Millisecond Software, LLC Date: 03-28-2018 last updated: 02-22-2022 by K. Borchert (katjab@millisecond.com) for Millisecond Software, LLC Script Copyright © 02-22-2022 Millisecond Software ___________________________________________________________________________________________________________________ BACKGROUND INFO ___________________________________________________________________________________________________________________ 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. References: Ridderinkhof, K.R.; van der Molen, M.W.; & Band, G.P.H (1997). Sources of Interference from Irrelevant Information: A Developmental Study. JOURNAL OF EXPERIMENTAL CHILD PSYCHOLOGY 65, 315–341. (Note: Ridderinkhof et al. used a more extensive design of the arrow flanker test; the Inquisit script only manipulates the direction of the center arrow) Note: The Inquisit arrowflankertest_touchscreen.iqx is designed to use on touchscreen devices but instructions will adapt if no touchscreen is detected (in those cases the mouse is used instead) ___________________________________________________________________________________________________________________ TASK DESCRIPTION ___________________________________________________________________________________________________________________ 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). ___________________________________________________________________________________________________________________ DURATION ___________________________________________________________________________________________________________________ the default set-up of the script takes appr. 3 minutes to complete ___________________________________________________________________________________________________________________ DATA FILE INFORMATION ___________________________________________________________________________________________________________________ The default data stored in the data files are: (1) Raw data file: 'arrowflankertest_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 session: 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. practice: 0 = test block; 1 = practice block blockcount: counts the test blocks run countPracticeBlocks: counts the number of practice runs trialcount: counts all trials per block congruence: determines the state of the flankers 1 = congruent (target and flanker point in the same direction), 2 = incongruent (target points in opposite direction) selecttarget: itemnumber of the current target (center) stimulus 1 = target points to right; 2 = target points to left 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) rt_homebase: the time (in ms) it took to press the homebase button; measured from onset of orange homebase list.ACC_practice.mean: the current proportion correct at this point in practice practicePass: 1 = participant passed practice; 0 = participant did not pass practice (2) Summary data file: 'arrowflankertest_touchscreen_summary*.iqdat' (a separate file for each participant) inquisit.version: Inquisit version run computer.platform: the platform the script was run on (win/mac/ios/android) startDate: date script was run startTime: time script was started subjectid: assigned subject id number groupid: assigned group id number sessionid: assigned session id number elapsedTime: time it took to run script (in ms); measured from onset to offset of script completed: 0 = script was not completed (prematurely aborted); 1 = script was completed (all conditions run) blockcount: number of test blocks run countPracticeBlocks: counts the number of practice runs list.ACC_practice.mean: the proportion correct at the end of the last practice run practicePass: 1 = participant passed practice; 0 = participant did not pass practice propcorrect: overall proportion correct (test trials only) meanrt: overall mean latency (in ms) of correct responses (test trials only) propcorrect_congruent: proportion correct for all congruent trials meanrt_congruent: mean latency (ms) of correct responses to congruent targets propcorrect_incongruent: proportion correct for all incongruent trials meanrt_incongruent: mean latency (ms) of correct responses to incongruent targets ___________________________________________________________________________________________________________________ EXPERIMENTAL SET-UP ___________________________________________________________________________________________________________________ 2 flanker congruence (congruent vs. incongruent), tested within 1-3 Practice Blocks: each block runs 8 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) - script is aborted after 3 unsuccessful practice runs (maximum number of practice runs editable under section Editable Parameters) 1 Test Block: runs 12 congruent (6 left, 6 right) and 12 incongruent trials (6 left, 6 right) (24 trials total) (number of trials can be edited under section Editable Parameters) Trial Sequence: homeBase (waits for finger to press homeBase) -> presents fixation star for parameters.fixationDuration (default: 1000ms) -> presents the target and flanker and waits for response (default: response Timeout = 1750ms) Note: the selected response button is highlighted for 100ms ___________________________________________________________________________________________________________________ STIMULI ___________________________________________________________________________________________________________________ stimuli: 5 arrows pointing right or left (flanker, flanker, target, flanker, flanker) Arrows can be edited under section Editable Stimuli ___________________________________________________________________________________________________________________ INSTRUCTIONS ___________________________________________________________________________________________________________________ Instructions provided by Millisecond Softare. They can be edited under section Editable Instructions ___________________________________________________________________________________________________________________ EDITABLE CODE ___________________________________________________________________________________________________________________ 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: /fixationDuration: the duration (in ms) of the fixation cross at the beginning of each trial (default: 1000ms) /homeBaseReminder: the delay (in ms) of the home base reminder if finger is not returned to home base (default: 2000ms) /responseTimeout: the response Timeout (ms); measured from onset of arrows (default: 1750ms) Note: to allow for infinite response time, remove /response = timeout(parameters.responseTimeout) from all relevant trials /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: 8) Note: needs to be divisible by 4 /maxPracticeRuns: the maximum number of practice runs (default: 3) /numberTestTrials: the number of test trials run (default: 24) Note: needs to be divisible by 4