Fig. 2

Spatial-tapping task. The Spatial-tapping task measures pointing accuracy in time and space on the tactile screen through six black dots in a circle of 100 mm apart. The task is to touch each target, one after the other, starting from the bottom right target, and moving counter-clockwise using the right index finger. There are three experimental conditions: (1) In the spontaneous phase which provides the means to evaluate an individual’s pacing internal clock. (2) In the rhythmic phase, participants are presented with an auditory rhythm to which they must synchronise their actions (ISI = 1100 ms; 700 ms, 500 ms, 400 ms, and 300 ms). (3) In the flash phase, participants are presented with random black dots which are flashed across the workspace and are not in rhythm with the auditory rhythm that must be used to pace their actions providing the means to test the strength of the representation-based goals for action