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. Author manuscript; available in PMC: 2019 Apr 29.
Published in final edited form as: Brain Stimul. 2017 Dec 29;11(3):492–500. doi: 10.1016/j.brs.2017.12.009

Fig. 3. taVNS/fMRI system overview.

Fig. 3.

a) picture of final taVNS electrodes that have been 3d printed and assembled b) CAD drawings of electrodes demonstrating the 3-piece design and “U” shaped spring clip. Ag/AgCl electrodes were affixed to the inside part of the electrode clips. c) Overview of how taVNS is synchronized and delivered to the participant in the fMRI scanner. Timing is driven from the console computer. Triggering of the direct current stimulator occurs in the equipment room which propagates an electrical stimulation current through a grounded RF filter and into the magnet room through a 10 m cable that attaches to the participant's ear in the scanner.