TABLE 1.

Sigmoid function parameters.

Parameter		a	b	c	d
Group 1	Performance	14.91 (8.12; 21.70)	235.31 (200.62; 270.00)	0.79 (0.71; 0.87)	0.18 (0.13; 0.22)
	Rating	6.16 (5.16; 7.16)	0.68 (–0.30; 1.67)	0.51 (0.41; 0.61)	0.27 (0.14; 0.40)
Group 2	Performance	18.56 (13.62; 23.51)	264.22 (216.18; 312.26)	0.87 (0.80; 0.95)	0.16 (0.12; 0.20)
	Rating	5.89 (5.00; 6.79)	1.13 (0.08; 2.90)	0.54 (0.43; 0.64)	0.28 (0.13; 0.43)
Group 3	Performance	15.68 (10.94; 20.43)	256.27 (214.05; 298.50)	0.86 (0.78; 0.93)	0.18 (0.14; 0.22)
	Rating	5.77 (4.93; 6.61)	0.31 (–0.98; 1.60)	0.60 (0.48; 0.71)	0.32 (0.17; 0.47)

The relationship between distance to target (performance) and sense of control (rating) were explained as sigmoid functions of noise level. The parameters for the functions are reported here with 95% confidence intervals.