National Acoustic Laboratories Library

Topographic recordings of auditory evoked potentials to speech: Subcortical and cortical responses

BELLIER, LUDOVIC

Topographic recordings of auditory evoked potentials to speech: Subcortical and cortical responses

Topographies of speech auditory brainstem response (speech ABR), a fine electrophysiological marker of speech
encoding, have never been described. Yet, they could provide useful information to assess speech ABR generators and
better characterize populations of interest (e.g., musicians, dyslexics). We present here a novel methodology of topographic
speech ABR recording, using a 32-channel low sampling rate (5 kHz) EEG system. Quality of speech ABRs
obtained with this conventional multichannel EEG system were compared to that of signals simultaneously recorded with
a high sampling rate (13.3 kHz) EEG system. Correlations between speech ABRs recorded with the two systems revealed
highly similar signals, without any significant difference between their signal-to-noise ratios (SNRs). Moreover, an
advanced denoising method for multichannel data (denoising source separation) significantly improved SNR and allowed
topography of speech ABR to be recovered.


Speech ABR,
FFR,
Event-related potential,
Brainstem

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