___________________________________________________________________________________________________________________ *Linguistic Selection Task - Mousetracking* ___________________________________________________________________________________________________________________ Script Author: Katja Borchert, Ph.D. (katjab@millisecond.com) for Millisecond Software, LLC Date: 04-16-2021 last updated: 02-24-2022 by K. Borchert (katjab@millisecond.com) for Millisecond Software, LLC Script Copyright © 02-24-2022 Millisecond Software Millisecond Software thanks Dr. Spivey for his generous help with this script! ___________________________________________________________________________________________________________________ BACKGROUND INFO ___________________________________________________________________________________________________________________ This script implements a linguistic selection mousetracking procedure based on Spivey et al (2005). Reference Spivey, M. J., Grosjean, M., and Knoblich, G. (2005). Continuous attraction toward phonological competitors. Proc. Natl. Acad. Sci. 102, 10393–10398 ___________________________________________________________________________________________________________________ TASK DESCRIPTION ___________________________________________________________________________________________________________________ Participants click on a STAET button at the bottom of the screen with the mouse which presents the two images, one in the upper left and one in the upper right corner of the screen. A soundfile that names one of the objects is played with a 500ms delay*. Participants are asked to click the named object as fast as possible. Mouse coordinates are recorded every ~17ms. *Delay: the delay was added to the procedure to maximize the chance that participants were already moving the mouse when soundfile was played. ___________________________________________________________________________________________________________________ DURATION ___________________________________________________________________________________________________________________ the default set-up of the script takes appr. 2.5 minutes to complete ___________________________________________________________________________________________________________________ DATA FILE INFORMATION ___________________________________________________________________________________________________________________ The default data stored in the data files are: (1) Raw data file: 'linguisticselectiontask_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. targetItemnumber: the selected itemnumber (1-8) of the target image trialType: 1 = target1 presented with phonological similar distractor 2 = target2 presented with phonological similar distractor 3 = target1 presented with control item 4 = target2 presented with control item targetPosition: 1 = target is presented on the left; 2 = target is presented on the right (Note: the four trials run per targetItemnumber present the target on the left and right equally often) distractorCategory: 1 = distractor is a foil (phonologically similar); 2 = distractor is a control item target: stores the file name of the presented target distractor: stores the file name of the presented distractor response: the participant's response correct: accuracy of response: 1 = correct response; 0 = otherwise latency: the response latency (in ms); measured from: onset of images (2) Summary data file: 'linguisticselectiontask_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) propCorrect: the overall proportion correct selection rate meanCorrRT: the overall mean correct response time (in ms) (3) Mouse tracking data file: 'linguisticselectiontask_stream*.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 display.canvasHeight: the pixel width of the active canvas display.canvasWidth: the pixel height of the active canvas display_height_mm: the width of the active canvas in mm display_width_mm: the height of the active canvas in mm (Note: the percentage sizes of the active canvas are by definition: 100% height, 100% width) 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 targetItemnumber: the selected itemnumber of the target image targetPosition: 1 = target is presented on the left; 2 = target is presented on the right distractorCategory: 1 = distractor is a foil (phonologically similar); 2 = distractor is a control item script.elapsedTime: the measured time (in ms) elapsed since start of script (start of script = 0ms) sound.target_soundfile.timestamp: the timestamp (in ms) of the target soundfile lastButtonResponse: the last recorded response (either: start, target, distractor) Note: the response of one trial ends a trial and will thus be listed under the following trial //stimuli positions in canvas percentages //Note: 0%-100% (from right to left), 0%-100% (from top to bottom) startButton_x_pct, startButton_y_pct, startButton_height_pct, startButton_width_pct, target_x_pct, target_y_pct, target_height_pct, target_width_pct, distractor_x_pct, distractor_y_pct, distractor_height_pct, distractor_width_pct, //stimuli positions in canvas pixels //Note: startButton_x_px, startButton_y_px, startButton_height_px, startButton_width_px, target_x_px, target_y_px, target_height_px, target_width_px, distractor_x_px, distractor_y_px, distractor_height_px, distractor_width_px, //stimuli positions in mm: //Note: height: 0mm => top of canvas; width: 0mm => left startButton_x_mm, startButton_y_mm, startButton_height_mm, startButton_width_mm, target_x_mm, target_y_mm, target_height_mm, target_width_mm, distractor_x_mm, distractor_y_mm, distractor_height_mm, distractor_width_mm, Mouse coordinates (in pixel, percentages and mm) mouse.x: the horizontal mouse coordinates in pixel mouse.y: the vertical mouse coordinate in pixel Note: if the mouse leaves the active canvas, you might get negative numbers x_pct, y_pct: positions in canvas percentages x_mm, y_mm: positions in canvas mm * separate data files: to change to one data file for all participants (on Inquisit Lab only), go to section "DATA" and follow further instructions ___________________________________________________________________________________________________________________ EXPERIMENTAL SET-UP ___________________________________________________________________________________________________________________ (1) Intro/Demo: one demo trial (2) Test: 8 item phonologically similar item pairs (e.g. candy/candle) - each phonologically similar item pair is presented together twice (each of the objects acts as the target (foil) once) - each item of the phonological item pair is presented with the same control item (e.g. candy-jacket; candle-jacket) once (in this case the phonologically similar objects are always the target) => 32 trials total Note: within each item pair, the position of the target is balanced (=> the target object appears twice on the left and twice on the right); the assignment of left/right is determined randomly within each item pair. Trialsequence: click 'start' button (in trial.start)-> images (target vs. distractor)-> target soundfile is played 500ms later -> response (Note: response can be recorded before soundfile ends playing) ___________________________________________________________________________________________________________________ STIMULI ___________________________________________________________________________________________________________________ images of phonological similar item pairs as well as corresponding soundfiles were generously provided by Dr. Spivey. Millisecond Software converted - the images to .png files - the audio files to .wav files. Note: audiofiles were shortened by Millisecond Software (the built-in 500ms delay was removed) ___________________________________________________________________________________________________________________ INSTRUCTIONS ___________________________________________________________________________________________________________________ provided by Millisecond Software - 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: