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. 2019 Feb 11;13:40. doi: 10.3389/fnhum.2019.00040

FIGURE 2.

FIGURE 2

The stochastic Resonance, a phenomenon invoked to explain the effects of tACS and more in particular of tRNS. According to this principle a signal containing a high level of noise has more chance to increase excitability of neurons that are near to activation threshold making them to discharge.