___________________________________________________________________________________________________________________ *Dichotic Listenting Task* - used by the Behavioural Laterality Battery- ___________________________________________________________________________________________________________________ Script Author: Katja Borchert, Ph.D. (katjab@millisecond.com) for Millisecond Software, LLC Date: 01-19-2021 last updated: 02-21-2022 by K. Borchert (katjab@millisecond.com) for Millisecond Software, LLC Script Copyright © 02-21-2022 Millisecond Software ___________________________________________________________________________________________________________________ BACKGROUND INFO ___________________________________________________________________________________________________________________ This script implements a Dichotic Listening Task similar to the one used by the Behavioural Laterality Battery (Parker et al, 2020). This task assesses the lateralisation of language processing. References: //Behavioural Laterality Battery: Adam J. Parker , Zoe V. J. Woodhead , Paul A. Thompson & Dorothy V. M. Bishop (2020): Assessing the reliability of an online behavioural laterality battery: A pre-registered study, Laterality, DOI: 10.1080/1357650X.2020.1859526 To link to this article: https://doi.org/10.1080/1357650X.2020.1859526 https://gorilla.sc/openmaterials/104636 //Dichotic Listening Tasks: Bless, J. J., Westerhausen, R., Arciuli, J., Kompus, K., Gudmundsen, M., & Hugdahl, K. (2013). Right on all Occasions?” – On the Feasibility of Laterality Research Using a Smartphone Dichotic Listening Application. Frontiers in Psychology, 4, 42. https://doi.org/10.3389/fpsyg.2013.00042 Hugdahl, K., & Andersson, L. (1986). The “Forced-Attention Paradigm” in Dichotic Listening to CV-Syllables: A Comparison Between Adults and Children. Cortex, 22, 417-432. https://doi.org/10.1016/S0010-9452(86)80005-3 ___________________________________________________________________________________________________________________ TASK DESCRIPTION ___________________________________________________________________________________________________________________ Participants hear two syllables (selected from: ba, da, ga, ka, pa, ta) through their left and right ear and are asked to indicate which syllable their heard best. ___________________________________________________________________________________________________________________ DURATION ___________________________________________________________________________________________________________________ the default set-up of the script takes appr. 5 minutes to complete ___________________________________________________________________________________________________________________ DATA FILE INFORMATION ___________________________________________________________________________________________________________________ The default data stored in the data files are: (1) Raw data file: 'blb_dichoticlistening_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. index: itemnumber of the selected soundfile soundfile: the selected soundfile leftSound: the sound played through the left ear rightSound: the sound played through the right ear dualSound: 1 = the left sound is different than the right sound 0 = the same sound is played in both ears response: the participant's response (selected response button) choice: left/right/other (= the selected ear; if an incorrect sound was selected it says 'other') (in case of mono sounds: if the correct sound was selected it will always say 'left') correct: accuracy of response: 1 = correct response (either the left or right sound was selected) 0 = otherwise (a different sound was selected) latency: the response latency (in ms); measured from: onset of sound Note: the soundfiles are ~500ms long. Any latencies smaller than that => participant responded before the entire soundfile was played (2) Summary data file: 'blb_dichoticlistening_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) * 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 - all 6 mono sounds are introduced, order is determined randomly - each sound can be played multiple times (2) Practice: 9 trials - all 6 mono sounds + (da-ba, ga-ta, ka-pa); order is randomly determined => each sound is played equally often during practice (3) 4 test blocks (see Editable Parameters) of 36 trials - order of trials is randomly determined for each block ___________________________________________________________________________________________________________________ STIMULI ___________________________________________________________________________________________________________________ the stimuli are provided by the Behavioural Laterality Battery (Parker et al 2020) and can be downloaded at: https://osf.io/4bqe6/ Note: if used, please cite reference articles for Dichotic Listening Task as given above. ___________________________________________________________________________________________________________________ INSTRUCTIONS ___________________________________________________________________________________________________________________ provided by Millisecond Software. The instructions are based on the ones used by the Behavioural Laterality Battery (Parker et al 2020). The instructions can edited in the provided htm-files. ___________________________________________________________________________________________________________________ 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: