Facilitating Effects of Transcranial Direct Current Stimulation on Motor Imagery Brain- Computer Interface With Robotic Feedback for Stroke Rehabilitation

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Facilitating Effects of Transcranial Direct Current Stimulation on Motor Imagery Brain- Computer Interface With Robotic Feedback for Stroke Rehabilitation.

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Facilitating Effects of Transcranial Direct Current Stimulation on Motor Imagery Brain- Computer Interface With Robotic Feedback for Stroke Rehabilitation Kai Keng Ang, PhD, Cuntai Guan, PhD, Kok Soon Phua, MSc, Chuanchu Wang, MSc, Ling Zhao, MSc, Wei Peng Teo, PhD, Changwu Chen, MSc, Yee Sien Ng, MBBS, Effie Chew, MBBS Archives of Physical Medicine and Rehabilitation Volume 96, Issue 3, Pages S79-S87 (March 2015) DOI: 10.1016/j.apmr.2014.08.008 Copyright © 2015 American Congress of Rehabilitation Medicine Terms and Conditions

Fig 1 Consolidated Standards of Reporting Trials flow diagram. Archives of Physical Medicine and Rehabilitation 2015 96, S79-S87DOI: (10.1016/j.apmr.2014.08.008) Copyright © 2015 American Congress of Rehabilitation Medicine Terms and Conditions

Fig 2 Positions of EEG channel locations. The reference electrode is located on the nasion. Channels on the left and right hemisphere for offline ERD analysis are labeled blue and green, respectively. Abbreviations: C, central electrodes; CP, centroparietal electrodes; F, frontal electrodes; FC, frontocentral electrodes; FT, frontotemporal electrodes; Gnd, ground electrode; P, parietal electrodes; PO, parieto-occipital electrodes; T, temporal electrodes; TP, temporal-posterior electrodes; z, electrode in midline. Archives of Physical Medicine and Rehabilitation 2015 96, S79-S87DOI: (10.1016/j.apmr.2014.08.008) Copyright © 2015 American Congress of Rehabilitation Medicine Terms and Conditions

Fig 3 Setup of (A) tDCS and (B) EEG-based MI-BCI with robotic feedback rehabilitation for stroke in a local hospital. The same setup is used for sham. Archives of Physical Medicine and Rehabilitation 2015 96, S79-S87DOI: (10.1016/j.apmr.2014.08.008) Copyright © 2015 American Congress of Rehabilitation Medicine Terms and Conditions

Fig 4 Acquisition of EEG for online and offline analysis. (A) Timing of the motor imagery of the stroke-affected hand or background rest tasks for the calibration session before commencement of the therapy. (B) Timing of the motor imagery of the stroke-affected hand using online MI-BCI with robotic feedback for the rehabilitation session. Archives of Physical Medicine and Rehabilitation 2015 96, S79-S87DOI: (10.1016/j.apmr.2014.08.008) Copyright © 2015 American Congress of Rehabilitation Medicine Terms and Conditions

Fig 5 Plot of the online accuracies of detecting MI of the stroke-affected hand versus the idle condition for the tDCS and sham groups during online evaluation part of the rehabilitation sessions. Accuracies are computed online by performing session-to-session transfer using the FBCSP algorithm trained on data from the calibration session to the evaluation part of each of the 10 rehabilitation sessions. Horizontal axis represents the 10 rehabilitation sessions the patients underwent. Vertical bar plots the SDs across subjects in each group. Archives of Physical Medicine and Rehabilitation 2015 96, S79-S87DOI: (10.1016/j.apmr.2014.08.008) Copyright © 2015 American Congress of Rehabilitation Medicine Terms and Conditions

Fig 6 Plot of the averaged ERD laterality coefficient of the therapy part of the rehabilitation sessions for the tDCS and sham groups. Vertical axis represents the ERD laterality coefficient computed by averaging the ERD computed from 0 to 8 seconds of EEG of all 160 trials of the MI-BCI with robotic feedback rehabilitation. Horizontal axis represents the 10 rehabilitation sessions the patients underwent. Vertical bar plots the SDs across subjects in each group. Archives of Physical Medicine and Rehabilitation 2015 96, S79-S87DOI: (10.1016/j.apmr.2014.08.008) Copyright © 2015 American Congress of Rehabilitation Medicine Terms and Conditions