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. 2019 Jul 18;6:2055668319854340. doi: 10.1177/2055668319854340

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© The Author(s) 2019

Creative Commons Non Commercial CC BY-NC: This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (http://www.creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 4. — Diagram of the electrical circuit used to estimate voltage (V2) and intensity (I2) of the stimulations delivered to the electrodes. Channel 1 of the oscilloscope measured and recorded the voltage across R1, a resistor in parallel with the electrodes (V1, to estimate voltage across electrodes). Channel 2 measured the voltage across R4, a resistor in series with the electrodes (V4, to estimate the current amplitude going through the electrodes).