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    Ear-EEG offers potential for at-home hearing tests, but signal detection is challenging. Higher stimulus repetition rates may improve signal-to-noise ratio (SNR) for auditory steady-state responses (ASSR) measured with ear-EEG.

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    Area of Science:

    • Auditory Neuroscience
    • Biomedical Engineering
    • Signal Processing

    Background:

    • Auditory steady-state responses (ASSR) are crucial for objective audiometry.
    • Ear-electroencephalography (ear-EEG) offers potential for in-home hearing assessments.
    • Small electrode distances in ear-EEG lead to low signal amplitudes, impacting ASSR detection.

    Purpose of the Study:

    • To investigate the signal-to-noise ratio (SNR) of ASSRs measured with ear-EEG.
    • To determine the influence of stimulus repetition rate on ASSR-SNR in ear-EEG.
    • To compare ear-EEG ASSR-SNR with traditional scalp EEG.

    Main Methods:

    • ASSRs were recorded using both ear-EEG and scalp EEG.
    • Broadband chirp stimuli were presented at repetition rates from 20 to 95 Hz.
    • The SNR of ASSRs was analyzed as a function of stimulus repetition rate.

    Main Results:

    • Ear-EEG and scalp EEG showed comparable SNR across most repetition rates.
    • A significantly lower SNR was observed for ear-EEG around 40 Hz.
    • Ear-EEG ASSR amplitude was constant, while noise exhibited a 1/f characteristic, leading to increased SNR with higher rates.

    Conclusions:

    • Higher stimulus repetition rates may enhance ASSR detection in ear-EEG applications.
    • Ear-EEG is a promising technique for objective audiometry outside clinical settings.
    • Further research into optimizing ear-EEG parameters for hearing aid users is warranted.