___________________________________________________________________________________________________________________ SHORT ATTENTION NETWORK TEST (short ANT) - Adult Version ___________________________________________________________________________________________________________________ Script Author: Katja Borchert, Ph.D. (katjab@millisecond.com) for Millisecond Software, LLC Date: 02-21-2013 last updated: 02-16-2022 by K. Borchert (katjab@millisecond.com) for Millisecond Software, LLC Script Copyright © 02-16-2022 Millisecond Software ___________________________________________________________________________________________________________________ BACKGROUND INFO ___________________________________________________________________________________________________________________ This script implements the Short Attention Network Test (ANT), a behavioral measure of orienting and executive attention. In contrast to the original ANT, the short ANT does not provide a measure of the alerting attention network. The implemented procedure is based on: This script implements the short Attention Network Test (shortANT) as shared by Dr. Fan: http://people.qc.cuny.edu/Faculty/Jin.Fan/Pages/Downloads.aspx the original ANT was published in: Fan, J., McCandliss, B. D., Sommer, T., Raz, A., & Posner, M. I. (2002). Testing the efficiency and independence of attentional networks. Journal of Cognitive Neuroscience, 14, 340–347. additional shortANT: Fan J, McCandliss BD, Fossella J, Flombaum JI, Posner MI. The activation of attentional networks. Neuroimage. 2005 Jun;26(2):471-9. doi: 10.1016/j.neuroimage.2005.02.004. Epub 2005 Mar 19. PMID: 15907304. ___________________________________________________________________________________________________________________ TASK DESCRIPTION ___________________________________________________________________________________________________________________ Participants are presented arrows either directly above or below a fixation cross. Arrows are flanked by other arrows that point in the same (congruent) or opposite direction (incongruent). Participants have to decide whether the central arrows point right or left. Several cue conditions (3) (may) alert the participants that the targets are about to come on screen and potentially where on the screen (above or below the fixation cross). ___________________________________________________________________________________________________________________ DURATION ___________________________________________________________________________________________________________________ the default set-up of the script takes appr. 12 minutes to complete ___________________________________________________________________________________________________________________ DATA FILE INFORMATION ___________________________________________________________________________________________________________________ The default data stored in the data files are: (1) Raw data file: 'shortant_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 blockcount: counts the number of experimental blocks run blockcode: the name and number of the current block trialcount: counts the number of trials run (resets after practice) trialcode: the name and number of the currently recorded trial practice: 1 = practice trial; 0 = test trial completetrialDuration: the complete duration (in ms) of one trial sequence (default: 4000ms) fixation1_duration: The actual duration (in ms) of the first fixation cross (400ms +) cue_duration: the duration (in ms) of the cue presentation (default: 100ms) ISI_cuetarget: the duration (in ms) of the fixation cross after cue presentation and before target (default: 400ms) target_duration: the maximal duration (in ms) of the target/flanker presentation (default: 1700ms) Note: equals the response window ITI_duration: the current intertrial interval (in ms) cuecondition: the current cue condition (1 = no cue; 2 = center cue; 3 = spatial cue) flankercongruence: the current flanker condition (1 = neutral; 2 = congruent; 3 = incongruent) targetposition: position of target relative to fixation (1 = above fixation; 2 = below fixation) targetdirection: the direction of the target (1 = right; 2 = left) picture.flanker1.currentitem/ picture.flanker4.currentitem: stores the images presented for targets and flankers Variables that contain x/y coordinates for cues, targets, flankers: /target_x /target_y /flanker1_x /flanker1_y /cue_x /cue_y response: the response of participant (scancode of response button: 18 = left E; 23 = right I; 57 = spacebar) correct: correctness of response (1 = correct, 0 = error) latency: response latency (in ms); measured from onset of target until response is made or trial times out (2) Summary data file: 'shortant_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) overallpropcorrect: overall proportion correct across all testblock trials meanrt_correct: overall mean RT (of correct responses) for test trials ********************* Main Effects: ********************* propCorrect_noCue: proportion correct responses in nocue condition meanrt_noCue: mean response time (in ms) of correct responses in nocue condition propCorrect_centerCue: proportion correct responses in centercue condition meanrt_centerCue: mean response time (in ms) of correct responses in centercue condition propCorrect_spatialCue: proportion correct responses in spatialcue condition meanrt_spatialCue: mean response time (in ms) of correct responses in spatialcue condition propCorrect_congruent: proportion correct responses in trials with target-congruent flankers (flankers that point in the same direction as target) meanrt_congruent: mean response time (in ms) of correct responses in trials with target-congruent flankers (flankers that point in the same direction as target) propCorrect_incongruent: proportion correct responses in trials with target-incongruent flankers (flankers that point in the opposite direction as target) meanrt_incongruent: mean response time (in ms) of correct responses in trials with target-incongruent flankers (flankers that point in the opposite direction as target) ********************* Interactions: ********************* propCorrect_congruentNC: proportion correct responses in trials with target-congruent flankers in No Cue Condition meanRT_correctCongruentNC: mean response time (in ms) of correct responses in trials with target-congruent flankers in No Cue Condition propCorrect_incongruentNC: proportion correct responses in trials with target-incongruent flankers in No Cue Condition meanRT_correctIncongruentNC: mean response time (in ms) of correct responses in trials with target-incongruent flankers in No Cue Condition (same for CC= center condition; SC = spatial condition) Expressions that use above expressions and calculate the 3 attentional network effects (Fan et al, 2005, p.473) alertingeffect = meanrt_correctnocue - meanRT_correctCenterCue orientingeffect = meanrt_correctcentercue - meanrt_correctspatialcue => Effect of orienting attention towards a specific location of information conflicteffect = meanrt_correctincongruent - meanrt_correctcongruent => Effect of resolving conflict between several possible responses (executive function) ___________________________________________________________________________________________________________________ EXPERIMENTAL SET-UP ___________________________________________________________________________________________________________________ 3 cue conditions (no cue, center cue, spatial cue) x 2 flanker conditions (congruent, incongruent) within-subjects design A) 1 Block of 12 Practice trial sequences with feedback B) 1 Blocks of 120 trial sequences each - no feedback EXPERIMENTAL BLOCKS: 120 trial sequences: 5 (repetitions) x 3 (cue conditions) x 2 (flanker conditions) x 2 (target positions) x 2 (target directions) Trial Sequence (one sequence for each cue condition) - randomly selected fixation (randomly chosen presentation time: 400ms +) -> cue (100ms) -> fixation (400ms) -> target (1700ms)-> intertrialinterval (depends: complete trialduration = 4s) ___________________________________________________________________________________________________________________ STIMULI ___________________________________________________________________________________________________________________ Size of Stimuli: Fan et al (2002) give specific dimensions of the size and distance of targets/flankers (p.345/346) => distance participant/screen: 65 cm => single line arrow : 0.55 degree visual angle => distance flankers/target: 0.06 degree visual angle (area covered by all: 3.08 degree visual angle) => distance target/fixation cross: 1.06 degree visual angle This script does NOT attempt to replicate these dimensions as different monitors require different fontsizes etc. Fine-tune fontsize of stimuli, distance of flanker to target, and position of target above and below fixation cross under section EDITABLE PARAMETERS ___________________________________________________________________________________________________________________ INSTRUCTIONS ___________________________________________________________________________________________________________________ Note: Instructions are modelled after the instructions generously made available by Dr. Fan Instructions 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: Stimuli Dimension/Placement: /fontsize_fixation: regulates the size of the fixation cross, in canvas height percentage (default: 3%) /cueSize: regulates the size of the cues, in canvas height percentage (default: 5%) /arrowSise: regulates the size of the target/flanker, in canvas height percentage (default: 5%) /flankerdistance: the relative screen distance between stimuli, in canvas width percentage (default: 5%) /top_y: the y-coordinate of the target above the fixation cross (default: 40%) /bottom_y: the y-coordinate of the target below the fixation cross (default: 60%) Trial Durations: /completetrialDuration: sets the complete duration (in ms) of one trial sequence (default: 4000ms) /minfixation1_duration: sets the minimum duration (in ms) of the first fixation cross in a trial sequence. The actual duration contains the addition of a random component: a randomly selected number between 0-1200ms is added to this fixation duration. (default: 400ms) /cue_duration: sets the duration (in ms) of the cue presentation (default: 100ms) /ISI_cuetarget: sets the duration (in ms) of the fixation cross after cue presentation and before target (default: 400ms) /target_duration: sets the maximal duration (in ms) of the target/flanker presentation (default: 1700ms) Note: equals the response window /practicefeedback_duration: sets the duration (in ms) of the feedback trial during practice (default: 2000ms) /readyDuration: duration (in ms) of the get-ready trial (default: 5000ms) Response Keys: /responsekey_left: the left response key (default: "E") /responsekey_right: the right response key (default: "I")