Table 1.

Demographics and characteristics of the CMM patients. The severity of mirror movements was evaluated with the WT rating scale and quantitatively assessed with the lateralization index. This index was calculated from the electromyographic signals recorded from left and right homologous hand muscles during the execution of unimanual movements. As the EMG was recorded during the fMRI, the laterality index was not calculated for the three patients that did not perform the MRI experiment

Subject	Age	Sex	Laterality	Family	Score WT	Laterality index
Patient 1	45	F	Right handed	Family 1	1	0.51
Patient 2	20	H	Right handed	Family 1	3	0.3
Patient 3	34	F	Right handed	Family 2	3	0.08
Patient 4	63	H	Right handed	Family 2	3	0.11
Patient 5	56	H	Right handed	Family 2	1	0.08
Patient 6	18	H	Right handed	Family 2	2	0.45
Patient 7	41	H	Right handed	Family 3	2	0.47
Patient 8	44	F	Right handed	Family 3	2	0.57
Patient 9	30	F	Right handed	Family 4	3
Patient 10	42	H	Right handed	Family 5	2
Patient 11	24	F	Right handed	Family 6	2.5	0.46
Patient 12	35	H	Right handed	Sporadic	3	0.12
Patient 13	42	H	Right handed	Sporadic	3	0.55
Patient 14	41	F	Right handed	Sporadic	3.5	0.54
Patient 15	43	F	Right handed	Sporadic	2	0.53
Patient 16	44	H	Right handed	Sporadic	2
Patient 17	27	F	Right handed	Sporadic	2	0.87
Patient 18	36	F	Right handed	Sporadic	2	0.71
Patient 19	46	H	Right handed	Sporadic	2	0.78
Patient 20	27	F	Right handed	Sporadic	3	0.57
Patient 21	32	F	Right handed	Sporadic	3	0.67

WT = Woods and Teuber scale: 0, no clear imitative movement; 1, barely discernible repetitive movement; 2, slight mirror movements, or stronger, but briefer, repetitive movements; 3, strong and sustained repetitive movement; 4, movement equal to that expected for the intended hand.