___________________________________________________________________________________________________________________ Perspective Taking Task (for children) - with touch/mouse input ___________________________________________________________________________________________________________________ Script Author: Katja Borchert, Ph.D. (katjab@millisecond.com) for Millisecond Software, LLC Date: 12-19-2023 last updated: 01-03-2024 by K. Borchert (katjab@millisecond.com) for Millisecond Software, LLC Script Copyright © 01-03-2024 Millisecond Software Millisecond Software thanks the E. Bialystok lab for sharing material and scripts! ___________________________________________________________________________________________________________________ BACKGROUND INFO ___________________________________________________________________________________________________________________ This script implements Millisecond Software's version of the Perspective Taking Test (Greenberg et al, 2013); a test to study perspective taking skill in children using a child-friendly setup. The original test was programmed in eprime and the test was translated into Inquisit by Millisecond software. Reference: Greenberg, A., Bellana, B., & Bialystok, E. (2013). Perspective-taking ability in bilingual children: Extending advantages in executive control to spatial reasoning. Cognitive Development, 28(1), 41–50. https://doi.org/10.1016/j.cogdev.2012.10.002 ___________________________________________________________________________________________________________________ TASK DESCRIPTION ___________________________________________________________________________________________________________________ After three practice trials, participants work on 12 trials in which they have to decide how an observer (here: an owl) sees a four-block array from one of three different spatial positions (90°, 180°, and 270° counter-clockwise from the child's position) by selecting one of four responses -- the correct response, the egocentric error, an incorrect choice in which the array is correct but in the wrong orientation for the viewer, and an incorrect choice in which the array includes an internal spatial error. This script uses touch (or mouse) input to collect responses ___________________________________________________________________________________________________________________ DURATION ___________________________________________________________________________________________________________________ the default set-up of the script takes appr. 7 minutes to complete ___________________________________________________________________________________________________________________ DATA FILE INFORMATION ___________________________________________________________________________________________________________________ The default data stored in the data files are: (1) Raw data file: 'perspectivetakingtask_touch_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: with the current subject id group: with the current group id 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. phase: practice vs test blockCounterPerPhase: the number of blocks run in the current phase trialCounterPerBlock: the number of trials run in the current block trialIndex: the trialIndex (1-12) target: stores the selected block target image owl: stores the selected owl image selectOwl: stores the itemnumber of the selected owl image option1: stores the option1 image option2: stores the option2 image option3: stores the option3 image option4: stores the option4 image selectedOption1: stores the response category of option1 (test: correct) selectedOption2: stores the response category of option2 (test: oriented -> correct front-back relationship of blocks but with a left-right reversal) selectedOption3: stores the response category of option3 (test: egocentric -> the child's view of the array) selectedOption4: stores the response category of option4 (test: structured -> correct internal structure of blocks but incorrect orientation relative to the owl's position Note: the assignment of options to screen positions is randomized for each trial //position allocations: 'top-left', 'top-right', 'bottom-left', 'bottom-right' option1Position: screen position for option1 option2Position: screen position for option2 option3Position: screen position for option3 option4Position: screen position for option4 response: the response of participant selectedOption: option1, option2, option3, option4 resp: the response category (correct, oriented, egocentric, structured) corrResp: stores the correct response key correct: 1 = correct response; 0 = other latency: response latency (in ms); measured from: onset of response options //screen positions of the 4 response options picture.option1.hposition: horizontal screen position of option1 (in screen percentages) picture.option1.vposition: vertical screen position of option1 (in screen percentages) picture.option2.hposition: horizontal screen position of option2 (in screen percentages) picture.option2.vposition: vertical screen position of option2 (in screen percentages) picture.option3.hposition: horizontal screen position of option3 (in screen percentages) picture.option3.vposition: vertical screen position of option3 (in screen percentages) picture.option4.hposition: horizontal screen position of option4 (in screen percentages) picture.option4.vposition: vertical screen position of option4 (in screen percentages) (2) Summary data file: 'perspectivetakingtask_touch_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) countCorrect: number of Correct responses countOriented: number of Oriented responses countEgocentric: number of Egocentric responses countStructured: number of Structured responses propCorrect: proportion Correct responses meanCorrRT: mean response time (in ms) of correct responding ___________________________________________________________________________________________________________________ EXPERIMENTAL SET-UP ___________________________________________________________________________________________________________________ (1) Practice: 3 examples - the examples are presented in fixed order (assignment of option1-option4 to screen positions is fixed as well but can be randomized if needed) - feedback provided - practice block can be repeated as often as needed (2) Test: 12 trials - three perspectives (looking from the left, from the back, from the right) x 4 blocks (blocks_0, blocks_90, blocks_180, blocks_270) - order of 12 trials randomized - screen position of option1-option4 randomized => Note: assigned screen position is tied to the response key for that option T (left, top) U (right, top) G (left, bottom) J (right, bottom) - no feedback during the test Trial Sequence: -> target block alone (2000ms) -> target block with Owl (2000ms) -> target block, Owl and 4 response options until response is made ___________________________________________________________________________________________________________________ STIMULI ___________________________________________________________________________________________________________________ provided by E. Bialystok lab - can be edited under section 'Editable Stimuli' ___________________________________________________________________________________________________________________ INSTRUCTIONS ___________________________________________________________________________________________________________________ provided by E. Bialystok lab - 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: //timing parameters / delayDuration_inms = 2000 //the delay duration (in ms) of owl/response options //note: the response options appear 2*2000ms = 4000ms after onset of target block / practiceFeedbackDuration_inms = 1500 //the feedback duration (in ms) during practice