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Transcranial random noise stimulation (tRNS) is a non-invasive brain stimulation technique and a form of transcranial electrical stimulation (tES). Terney et al from Göttingen University was the first group to apply tRNS in humans in 2008. They showed that by using an alternate current along with random amplitude and frequency (between 0.1 and 640 Hz) in healthy subjects, the motor cortex excitability increased (i.e. increased amplitude of motor evoked potentials) for up to 60 minutes after 10 minutes of stimulation. The study included all the frequencies up to half of the sampling rate (1280 samples/s) i.e. 640 Hz, however the positive effect was limited only to higher frequencies.