READ ME File For 'Cortical Responses to Continuous Aided ISTS'

Dataset DOI: https://doi.org/10.5258/SOTON/D3397 

README Author: Ghadah Aljarboa, University of Southampton ORCID ID [https://orcid.org/0000-0003-3442-9211]

This dataset supports the PhD thesis:
"Exploring Factors Important for Clinical Application of Cortical Responses to Continuous Speech'
" [specifically chapter 6]

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Contents
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- Overview for EEG data
- Experimental Conditions
- Data Format
- Participants

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Overview
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This dataset contains EEG recordings collected from 24 participants using the BioSemi system. The data is stored in .bdf format and was recorded under different experimental conditions involving the presentation of ISTS (International Speech Test Signal) prerecorded from KEMAR manikin ear with and without hearing aids (HA). The dataset is structured based on subject IDs (e.g., S01, S02, etc.), which indicate the number of subjects recorded under each condition.

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Experimental Conditions
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The following conditions were used during data collection:

1- Aided-50:

ISTS was presented at 50 dB LAeq to KEMAR with a hearing aid (HA).
The output was recorded and adjusted to be at 70 dB LAeq as an output from the insets.

2- Aided-70:

ISTS was presented at 70 dB LAeq to KEMAR with an HA.
The output was recorded and adjusted and calibrated to match a 70 dB LAeq output from the insets.

3- Unaided-50:

ISTS was presented at 50 dB LAeq to KEMAR without an HA.
The recorded stimulus was adjusted and calibrated to match a 50 dB LAeq output from the insets.

4- Unaided-70:

ISTS was presented at 70 dB LAeq to KEMAR without an HA.
The recorded stimulus was adjusted and calibrated to match a 70 dB LAeq output from the insets.

5- Unaided-70 (Attention):

This condition repeated the Unaided-70 scenario but with active listening.
Participants performed a counting task to ensure engagement and attention.

6- /da/
The study included an additional condition focused on measuring CAEP in response to the repeated /da/ sound. 

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Data Format
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The EEG recordings are stored in .bdf (BioSemi Data Format) files.
Each file corresponds to a specific subject (S01, S02, ..., S24) and condition.
EEG recordings include 32 channels and reference signals recorded during each condition.

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Participants
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This study initially involved 27 participants; however, due to EEG recording issues, data from three individuals were unusable. 
All participants had normal hearing thresholds, ensuring that the presentation levels were comfortable.


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Geographic location of data collection: University of Southampton, U.K.

Dataset available under a CC BY 4.0 licence

Publisher: University of Southampton, U.K.

Date: Feb 2025