Table 2. Preference strategy for selection of control group.

		Comparison group is equivalent to the synchronous group in the following characteristics
	Type of comparison	Synchrony	Coordination	Same m/s	Inter-action	Group setting	Treatment
Note. m/s = movement/sensory stimulation.
1	Same m/s, coordinated (anti-phase)	No	Yes	Yes	Yes	Yes	Yes
2	Same m/s, not coordinated	No	No	Yes	Yes	Yes	Yes
3	Different m/s, interacting	No	No	No	Yes	Yes	Yes
4	Different m/s, not interacting	No	No	No	No	Yes	Yes
5	No group setting	No	No	No	No	No	Yes
6	No treatment	No	No	No	No	No	No