Removal of Transcranial a.c. Current Stimulation artifact from simultaneous EEG recordings by superposition of moving averages

Transcranial Current Stimulation (tCS) is a recent development for non-invasive brain stimulation. At present tCS introduces large artifacts into simultaneous EEG (electroencephalogram) recordings, which must be removed to enable brain changes from during the stimulation to be monitored. This paper presents a new approach for removing artifacts of transcranial Alternating Current Stimulation (tACS) from simultaneous EEG. Termed the Superposition of Moving Averages (SMA) our approach is independent of the number of EEG channels used and has a low computational complexity for use in real-time online artifact removal and data responsive stimulation. Compared to a Principal Component Analysis (PCA) approach our results show that SMA achieves superior artifact removal performance, especially with regards to the use of low channel count EEG devices.

[1]  L. Cohen,et al.  Transcranial DC stimulation (tDCS): A tool for double-blind sham-controlled clinical studies in brain stimulation , 2006, Clinical Neurophysiology.

[2]  Robert Turner,et al.  A Method for Removing Imaging Artifact from Continuous EEG Recorded during Functional MRI , 2000, NeuroImage.

[3]  Ganesan Venkatasubramanian,et al.  Transcranial Direct Current Stimulation in Schizophrenia , 2013, Clinical psychopharmacology and neuroscience : the official scientific journal of the Korean College of Neuropsychopharmacology.

[4]  Rami K. Niazy,et al.  Removal of FMRI environment artifacts from EEG data using optimal basis sets , 2005, NeuroImage.

[5]  Bin He,et al.  Simultaneous high-definition transcranial direct current stimulation of the motor cortex and motor imagery , 2014, 2014 36th Annual International Conference of the IEEE Engineering in Medicine and Biology Society.

[6]  M. Nitsche,et al.  Induction of self awareness in dreams through frontal low current stimulation of gamma activity , 2014, Nature Neuroscience.

[7]  P. Brown,et al.  Tremor Suppression by Rhythmic Transcranial Current Stimulation , 2013, Current Biology.

[8]  C. Herrmann,et al.  Transcranial alternating current stimulation: a review of the underlying mechanisms and modulation of cognitive processes , 2013, Front. Hum. Neurosci..

[9]  Bin He,et al.  High-Definition Transcranial Direct Current Stimulation Induces Both Acute and Persistent Changes in Broadband Cortical Synchronization: A Simultaneous tDCS–EEG Study , 2014, IEEE Transactions on Biomedical Engineering.

[10]  J. Leon Kenemans,et al.  Neurophysiological predictors of non-response to rTMS in depression , 2012, Brain Stimulation.

[11]  Michal Lavidor,et al.  Prefrontal oscillatory stimulation modulates access to cognitive control references in retrospective metacognitive commentary , 2014, Clinical Neurophysiology.

[12]  A. Engel,et al.  Entrainment of Brain Oscillations by Transcranial Alternating Current Stimulation , 2014, Current Biology.

[13]  Michael X Cohen,et al.  Analyzing Neural Time Series Data: Theory and Practice , 2014 .

[14]  Norbert Jaušovec,et al.  Increasing working memory capacity with theta transcranial alternating current stimulation (tACS) , 2014, Biological Psychology.