Table 4.

Mixed-effect model for stiffness area at the start of the movement

Model:
Ky ∼ 1 + velocity + reward + (1 | participant)
No. of observations	40	AIC	460.82
Fixed effects coefficients	3	BIC	469.27
Random effects coefficients	32	Log-likelihood	−225.41
Covariance parameters	2	Deviance	450.82
Fixed effects coefficients (95% CIs):
Variable	Estimate	SE	t statistic	df	p value	Lower	Upper
Intercept	−421.01	134.26	−3.188	37	0.0029121	−700.04	−155.98
Velocity	184.74	138.08	1.3379	37	0.18909	−95.041	464.53
Reward	−12.34	16.319	−0.75617	37	0.45434	−45.406	20.726
Random effects covariance parameters (95% CIs):
Variable	Levels	Type	Estimate	Lower	Upper
Participant	30	SD	97.543	70.244	135.45
Error	NA	Residual SD	32.425	23.767	44.237