Table 2.

Characteristic indicators of the dual balancing task.

Subject	STD ${\theta }_s$ (deg)	Freq-peak ${\theta }_s$ (Hz)	STD $x_s$ (cm)	Corrcoef $x_{s}vs.{\theta }_s$	Corrcoef $x_{s}vs.{\theta }_{com}$
1	2.86	0.35	13.69	−0.67	0.74
2	1.32	0.39	11.83	−0.25	0.18
3	2.65	0.41	11.43	−0.75	0.76
4	1.93	0.39	13.85	−0.65	0.90
5	2.53	0.41	12.12	−0.66	0.91
6	1.00	0.43	9.46	−0.30	0.92
7	1.54	0.37	6.49	−0.11	0.90
8	1.59	0.35	8.86	−0.67	0.87
9	1.86	0.39	10.71	−0.61	0.81
10	0.81	0.34	8.46	−0.38	0.23
11	1.65	0.31	14.37	−0.54	0.95
12	1.51	0.34	8.31	−0.71	0.76
13	0.84	0.56	7.89	−0.44	0.93
14	1.44	0.51	8.89	−0.56	0.87
Median	1.57	0.39	10.09	−0.58	0.87
Model	1.52	0.41	15.03	−0.61	0.76

STD: Standard Deviation; ${\theta }_s$: tilt angle of the stick from the vertical; $x_s$: back and forth motion of the CIP-like device; Freq-peak: frequency peak of the FFT of ${\theta }_s$; Corrcoef: Correlation Coefficient; Model refers to the average value. for each parameter. of model simulations; Median refers to the measurements from the whole population of subjects.