Table 1.

Age effects on mean univariate and spread of multivariate action effects

Experiment	Measure/ROI		Age effect		Linear		Quadratic
Experiment	Measure/ROI		F (R²)	p	t (β)	p	t (β)	p
Sensorimotor	Univariate mean	Contralateral	31.7 (5.29)	<0.0001	−7.95 (−7.5)	<0.0001	−0.3 (−0.29)	0.76
	Univariate mean	Ipsilateral	18.2 (2.89)	<0.0001	5.26 (1.22)	<0.0001	−3.11 (−0.72)	0.002
	Multivariate spread	Contralateral	4.82 (0.81)	0.008	2.31 (0.008)	0.021	−2.08 (−0.007)	0.038
	Multivariate spread	Ipsilateral	2.97 (0.49)	0.052
Free selection	Univariate mean	Contralateral	4.49 (5.29)	0.014	1.88 (1.34)	0.067	−2.32 (−1.6)	0.025
	Univariate mean	Ipsilateral	9.31 (10.2)	0.0002	3.66 (1.68)	0.0004	0.900 (−1)	0.032
	Multivariate spread	Contralateral	2.83 (3.24)	0.065
	Multivariate spread	Ipsilateral	2.02 (2.56)	0.14

Effect sizes for the total age effect (linear and quadratic) and for the linear/quadratic effects separately are expressed as the proportion of explained variance (R²), as a percentage, and as standardized regression coefficients (β), respectively. Degrees of freedom in experiment 1: age effect F_(2,583) and t₍₅₈₃₎; experiment 2: Age F_(2,78) and t₍₇₈₎. Boldface indicates p < 0.05.