title: Topographic recordings of auditory evoked potentials to speech: subcortical and cortical responses.
abstract: 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.
authors.affiliation: Lyon Neuroscience Research Center, Brain Dynamics and Cognition team, INSERM U1028, CNRS UMR5292, Lyon, France; University Lyon 1, Lyon, France.
authors.forename: Ludovic
authors.initials: L
authors.lastname: Bellier
authors.forename: Patrick
authors.initials: P
authors.lastname: Bouchet
authors.forename: Arnaud
authors.initials: A
authors.lastname: Jeanvoine
authors.forename: Olivier
authors.initials: O
authors.lastname: Valentin
authors.forename: Hung
authors.initials: H
authors.lastname: Thai-Van
authors.forename: Anne
authors.initials: A
authors.lastname: Caclin
mesh_terms: D000161:Acoustic Stimulation; D000328:Adult; D001303:Auditory Cortex / Q000502:physiology*; D001931:Brain Mapping / Q000379:methods; D004569:Electroencephalography; D005072:Evoked Potentials, Auditory / Q000502:physiology*; D016057:Evoked Potentials, Auditory, Brain Stem / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D013067:Speech Perception / Q000502:physiology*; D055815:Young Adult
keywords: Brainstem; Event-related potential; FFR; N1; Speech ABR