Table 2.

Expression of fear.

	N		Fixed parameter	SE b	95% CI	(U)	Random parameter	SE Var
			b		(L)		Variance
(A) PARAMETER ESTIMATES OF THE FIXED AND RANDOM EFFECTS IN THE FEAR IMITATION CONDITION OF MUSCLES ON THE RIGHT
Trapezius	22	Intercept	−9.720	1.674	−13.017	−6.422	0.345	0.118
		Linear	2.873	0.464	1.959	3.787***
		Quadratic	−0.221	0.041	−0.301	−0.141***
		Cubic	0.005	0.001	0.003	0.007***
Forearm	24	Intercept	−52.953	6.826	−66.392	−39.514	3.882	1.631
		Linear	14.341	1.881	10.637	18.045***
		Quadratic	−1.071	0.164	−1.393	−0.749***
		Cubic	0.025	0.005	0.016	0.034***
Lower back	23	Intercept	−10.410	1.491	−13.3463	−7.474	0.238	0.192
		Linear	2.820	0.413	2.006	3.634***	0.003	0.002
		Quadratic	−0.189	0.036	−0.260	−0.118***
		Cubic	0.004	0.001	0.002	0.006***
Calf	21	Intercept	−15.298	2.205	−19.640	−10.955	0.987	0.328
		Linear	4.256	0.610	3.054	5.458***
		Quadratic	−0.312	0.053	−0.417	−0.207***
		Cubic	0.007	0.001	0.004	0.010***
(B) PARAMETER ESTIMATES OF THE FIXED AND RANDOM EFFECTS IN THE FEAR IMITATION CONDITION OF MUSCLES ON THE LEFT
Trapezius	23	Intercept	−9.405	1.804	−12.957	−5.853	0.336	0.121
		Linear	2.747	0.501	1.762	3.733***
		Quadratic	−0.206	0.044	−0.292	−0.120***
		Cubic	0.005	0.001	0.002	0.007***
Forearm	21	Intercept	−57.413	7.357	−71.905	−42.921	4.546	1.814
		Linear	15.304	2.029	11.307	19.301***
		Quadratic	−1.113	0.177	−1.461	−0.765***
		Cubic	0.025	0.005	0.015	0.034***
Lower back	22	Intercept	−9.072	1.922	−12.856	−5.288	0.229	0.087
		Linear	2.415	0.533	1.366	3.464***
		Quadratic	−0.151	0.047	−0.243	−0.059***
		Cubic	0.003	0.001	0.0001	0.005*
Calf	23	Intercept	−13.382	2.358	−18.025	−8.740	1.058	0.341
		Linear	3.690	0.651	2.409	4.971***
		Quadratic	−0.263	0.057	−0.374	−0.151***
		Cubic	0.006	0.002	0.003	0.009***

Parameter estimates, 95% confidence intervals and significance levels of the best fitting model for each muscle on the (A) right and (B) left in the fear imitation condition.

^*p < 0.05;

^***p < 0.001.