Table 1. Experimental conditions and characteristics of the metronomes.

Sensory Modality	Structure	Auditory frequency	Tactile frequency (and phasing)	Label
Audio-tactile	Simple	Ωball	Ωhand (Π = 0)	Multi. Simp.
Audio-tactile	Simple	Ωball	Ωhand (Π = π)	Multi. Anti.
Audio-tactile	Double	2*Ωball	2*Ωhand (Π = 0)	Multi. Doub.
Tactile	Double	-	2*Ωhand (Π = 0)	Tact. Doub.
Audio	Double	2*Ωball	-	Audio. Doub.
-	-	-	-	Control

The sensory modalities (multimodal – solid line frame – vs. tactile or auditory unimodal) and the metronome parameters have been manipulated. We distinguished simple metronome from double metronome (dashed frame) for which the tactile and auditory metronome have been set equal to or twice the hands and balls frequency respectively. In one of the simple, multimodal metronome, the vibrotactile stimuli were presented in antiphase at the wrists (Multi. Anti, Π = π). Otherwise Π = 0 indicates that the vibrotactile stimuli were presented simultaneously.