Effects of Transcranial Alternating Current Stimulation on Repetitive Finger Movements in Healthy Humans

Figure 1

Experimental design. Finger tapping movements were recorded during no stimulation (NS), sham (SH), beta (β), and gamma (γ) tACS using an optoelectronic motion system. The four conditions were tested in a random order. We recorded one trial for each condition in 3 separate, consecutive blocks (total of 12 trials). Each trial consisted of 15 seconds of finger tapping. A 5-minute and 10-minute rest period was provided between each trial and between each block, respectively, to avoid fatigue. At the end of the kinematic recordings, the participants underwent a TMS assessment. Twenty single-pulse MEPs were recorded at rest during NS, SH, β, and γ tACS. The four conditions were randomized and performed at 5-minute intervals.