Title :
Speech perception: Single trial analysis of the N1/P2 complex of unimodal and audiovisual evoked responses
Author :
Zouridakis, G. ; Baart, Martijn ; Stekelenburg, Jeroen J. ; Vroomen, Jean
Author_Institution :
Basque Center on Cognition, Brain & Language, San Sebastian, Spain
Abstract :
Audiovisual speech integration is reflected in the electrophysiological N1/P2 complex. In this study, we analyzed recordings of electroencephalographic brain activity from 28 subjects who were presented with combinations of auditory, visual, and audiovisual stimuli, using single trial analysis based on an independent component analysis procedure. We found that, with respect to the N1/P2 complex, single trials across all subjects and all conditions could be separated into two groups, one with `typical´ responses having the same polarity as the average response and another one with `aberrant´ responses having opposite polarity. Furthermore, the number of aberrant responses in non-speech interpretation of auditory stimuli was significantly lower compared to speech, which may affect the N1/P2 complex in the ensemble average EP.
Keywords :
auditory evoked potentials; electroencephalography; independent component analysis; neurophysiology; speech; visual evoked potentials; audiovisual evoked responses; audiovisual speech integration; audiovisual stimuli; auditory stimuli; electroencephalographic brain activity recordings; electrophysiological N1-P2 complex analysis; independent component analysis procedure; speech perception; unimodal evoked responses; Electric potential; Electrodes; Electroencephalography; Independent component analysis; Speech; Speech processing; Visualization;
Conference_Titel :
Bioinformatics and Bioengineering (BIBE), 2013 IEEE 13th International Conference on
Conference_Location :
Chania
DOI :
10.1109/BIBE.2013.6701590