title: Articulation Artifacts During Overt Language Production in Event-Related Brain Potentials: Description and Correction.
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.
authors: Department of Physics, Hong Kong Baptist University, Kowloon Tong, Hong Kong.|Centre for Nonlinear Studies and The Beijing-Hong Kong-Singapore Joint Centre for Nonlinear and Complex Systems (Hong Kong), Institute of Computational and Theoretical Studies, Hong Kong Baptist University, Kowloon Tong, Hong Kong.|Department of Psychology, Ernst-Moritz-Arndt-Universität Greifswald, Greifswald, Germany.
authors: Guang
authors: G
authors: Ouyang
authors: Department of Psychology, Humboldt-Universität zu Berlin, Rudower Chaussee 18, 12489, Berlin, Germany.
authors: Werner
authors: 0000-0001-5266-3445
authors: W
authors: Sommer
authors: Department of Physics, Hong Kong Baptist University, Kowloon Tong, Hong Kong. cszhou@hkbu.edu.hk.|Centre for Nonlinear Studies and The Beijing-Hong Kong-Singapore Joint Centre for Nonlinear and Complex Systems (Hong Kong), Institute of Computational and Theoretical Studies, Hong Kong Baptist University, Kowloon Tong, Hong Kong. cszhou@hkbu.edu.hk.|Research Centre, HKBU Institute of Research and Continuing Education, Virtual University Park Building, South Area Hi-tech Industrial Park, Shenzhen, 518000, China. cszhou@hkbu.edu.hk.|Beijing Computational Science Research Center, Beijing, 100084, China. cszhou@hkbu.edu.hk.
authors: Changsong
authors: C
authors: Zhou
authors: Department of Psychology, Humboldt-Universität zu Berlin, Rudower Chaussee 18, 12489, Berlin, Germany.
authors: Sabrina
authors: S
authors: Aristei
authors: Department of Psychology, Humboldt-Universität zu Berlin, Rudower Chaussee 18, 12489, Berlin, Germany.
authors: Thomas
authors: T
authors: Pinkpank
authors: Department of Psychology, Humboldt-Universität zu Berlin, Rudower Chaussee 18, 12489, Berlin, Germany. rasha.abdel.rahman@hu-berlin.de.
authors: Rasha
authors: R
authors: Abdel Rahman
mesh_terms: D000293:Adolescent; D000328:Adult; D016477:Artifacts; D001921:Brain / Q000502:physiology*; D004569:Electroencephalography / Q000379:methods; D005071:Evoked Potentials / Q000502:physiology*; D005260:Female; D006801:Humans; D007802:Language; D008297:Male; D009068:Movement; D013060:Speech; D014831:Voice; D055815:Young Adult
keywords: Artefact correction; Electro-magneto articulography; Event-related potential; Language; Method; Residue iteration decomposition; Speech artifact; Speech production