Response to the Response to “Does tDCS Actually Deliver DC Stimulation?”
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Figure 1
Real-time monitoring of applied voltage, injected current, and body resistance during a two-minute tDCS application showing ramp-up and ramp-down. A commercial tDCS device was used to demonstrate stable delivery of current without flickers or jumps. Iontophoresis device (Chattanooga Ionto, Chattanooga Group, Hixson, TN) was used for tDCS application in combination with a DAQ device for voltage (blue) and current (green) measurements (DI-245, DATAQ Instruments, Akron, OH). Body resistance (red) was derived using Ohm's law (V = IR). Actual injected current was 2 mA, but the current was scaled by 10× to ease visual comparison. This plotting technique allows time-based comparison between applied voltage and applied current at 2 mA. Note: the high body resistance initially declines rapidly to <10 kΩ during the initial ramp-up period and starts increasing during ramp down (see inset) consistent with the literature. The peak-to-peak fluctuations/noise floor in injected current using this commercial device was less than 0.5%, or less than 10 µA. We found comparable results with other commercial tDCS devices as well. (For interpretation of the references to color in this figure legend, the reader is referred to the web version of this article.)
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