Figure 2: Topographic illustration of signal power during different experimental conditions.
From: In vivo assessment of human brain oscillations during application of transcranial electric currents
Signal power is shown in absence of electric stimulation (black), during stimulation with device A (red) and device B (blue) using a phantom head. Noise levels as measured in a magnetoencephalography (MEG) sensor with the highest level of noise above the extracephalic stimulation electrode (a), anterior of the electrode (b), in the most frontal (c) and occipital (d) MEG sensor. While noise is strongest above the electrode during stimulation with device A (NeuroConn DC Stimulator Plus); device B (prototype of NeuroConn DC Stimulator nG) generates much less noise (a), decreasing with distance from the electrode (b,c). We used different stimulation devices to investigate whether robustness of TESANA depends on the magnitude of stimulator noise.
