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Topographic recordings of auditory evoked potentials to speech: Subcortical and cortical responses
Ist Teil von
Psychophysiology, 2015-04, Vol.52 (4), p.594-599
Ort / Verlag
United States: Blackwell Publishing Ltd
Erscheinungsjahr
2015
Link zum Volltext
Quelle
Psychology and Behavioral Sciences Collection
Beschreibungen/Notizen
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.