Script Author: Katja Borchert, Ph.D. (katjab@millisecond.com), Millisecond
Created: January 19, 2021
Last Modified: January 31, 2023 by K. Borchert (katjab@millisecond.com), Millisecond
Script Copyright © Millisecond Software, LLC
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.
https://gorilla.sc/openmaterials/104636
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
5 minutes
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.
(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
the stimuli are provided by the Behavioural Laterality Battery (Parker et al 2020)
and can be downloaded at:
https://osf.io/4bqe6/
if used, please cite reference articles for Dichotic Listening Task as given above.
provided by Millisecond. 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.
File Name: blb_dichoticlistening_summary*.iqdat
| Name | Description |
|---|---|
| inquisit.version | Inquisit version number |
| computer.platform | Device platform: win | mac |ios | android |
| startDate | Date the session was run |
| startTime | Time the session was run |
| subjectId | Participant ID |
| groupId | Group number |
| sessionId | Session number |
| elapsedTime | Session duration in ms |
| completed | 0 = Test was not completed 1 = Test was completed |
File Name: blb_dichoticlistening_raw*.iqdat
| Name | Description |
|---|---|
| build | Inquisit version number |
| computer.platform | Device platform: win | mac |ios | android |
| date | Date the session was run |
| time | Time the session was run |
| subject | Participant ID |
| group | Group number |
| session | Session number |
| blockCode | Name of the current block |
| blockNum | Number of the current block |
| trialCode | Name of the current trial |
| trialNum | Number of the current trial |
| 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 the soundfiles are ~500ms long. Any latencies smaller than that => participant responded before the entire soundfile was played |
The procedure can be adjusted by setting the following parameters.
| Name | Description | Default |
|---|---|---|
| fixationHeight | The proportional height of the fixation cross | 10% |
| fixationDuration | The duration (in ms) of the fixation cross | 500 |
| numberTestBlocks | The number of test blocks to run ( each test block runs 36 trials) | 4 |