Distribution of pins placed during the Purdue Pegboard Test. This plot compares the effects of tACS and sham stimulation on motor dexterity, measured pre- and poststimulation, for three task conditions: bimanual/both hands assembly A), left hand only B), and right hand only C). For the bimanual assembly task, the y axis represents the total number of parts (pins, collars, washers). The boxplots show the median and interquartile range to visually summarize central tendency and dispersion. The horizontal line within the box plot represents the median. The top and bottom lines represent the upper and lower quartiles, respectively. The data points outside of the whiskers are >1.5 quartiles. The line connecting the paired violins visualizes the direction of poststimulation changes. Asterisk (^*) denotes a statistically significant pre- to postchange ^**P < 0.01.