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01-11-2016 | Original Paper

Articulation Artifacts During Overt Language Production in Event-Related Brain Potentials: Description and Correction

Authors: Guang Ouyang, Werner Sommer, Changsong Zhou, Sabrina Aristei, Thomas Pinkpank, Rasha Abdel Rahman

Published in: Brain Topography | Issue 6/2016

Abstract

Overt articulation produces strong artifacts in the electroencephalogram and in event-related potentials (ERPs), posing a serious problem for investigating language production with these variables. Here we describe the properties of articulation-related artifacts and propose a novel correction procedure. Experiment 1 co-recorded ERPs and trajectories of the articulators with an electromagnetic articulograph from a single participant. The generalization of the findings from the single participant to standard picture naming was investigated in Experiment 2. Both experiments provided evidence that articulation-induced artifacts may start up to 300 ms or more prior to voice onset or voice key onset—depending on the specific measure; they are highly similar in topography across many different phoneme patterns and differ mainly in their time course and amplitude. ERPs were separated from articulation-related artifacts with residue iteration decomposition (RIDE). After obtaining the artifact-free ERPs, their correlations with the articulatory trajectories dropped near to zero. Artifact removal with independent component analysis was less successful; while correlations with the articulatory movements remained substantial, early components prior to voice onset were attenuated in reconstructed ERPs. These findings offer new insights into the nature of articulation artifacts; together with RIDE as method for artifact removal the present report offers a fresh perspective for ERP studies requiring overt articulation.

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Title: Articulation Artifacts During Overt Language Production in Event-Related Brain Potentials: Description and Correction
Authors: Guang Ouyang
Werner Sommer
Changsong Zhou
Sabrina Aristei
Thomas Pinkpank
Rasha Abdel Rahman
Publication date: 01-11-2016
Publisher: Springer US
Published in: Brain Topography / Issue 6/2016
Print ISSN: 0896-0267
Electronic ISSN: 1573-6792
DOI: https://doi.org/10.1007/s10548-016-0515-1

At a glance: The STEP trials

Springer Medicine

Articulation Artifacts During Overt Language Production in Event-Related Brain Potentials: Description and Correction

Abstract

At a glance: The STEP trials

Springer Medicine

Abstract

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