In such tasks, the participant must tap the forefinger of each hand at a specified rate, either at a ‘comfortable’ (self-paced) rate or “as fast as you can.” Some investigators complicate the task by requiring both hands to tap a regular rhythm, but with one hand tapping twice for each single tap of the other (polyrhythmic tapping). For right-handers, tapping normally is faster when the right hand taps at the faster rate, whereas no group differences appear for left- handers.
See Bimanual task, Hand preference, Hand proficiency, Handedness (bimanual versus unimanual)