The Effect of Transcranial Alternating Current Stimulation on Cortical Excitability in Humans

Interference with brain rhythms by non-invasive transcranial stimulation using weak transcranial alternating current (tACS) may reveal itself to be a new tool for investigating cortical mechanisms currently unresolved. Here, we aim to extend transcranial direct current stimulation (tDCS) techniques to transcranial alternating current stimulation (tACS). Parameters such as electrode size and position were taken from those used in previous tDCS studies. Motor evoked potentials (MEPs) revealed by transcranial magnetic stimulation (TMS), EEG-power and reaction times measured in a motor implicit learning task, were a…