Table S2.

PCA weights

Temporal and kinematic measurements	Weights
IT	−0.108
MT	0.674
TT	0.397
PV	0.032
TimePV	−0.010
h-AUC	0.093
SCA	0.389
SCD	0.107
v-AUC	0.794
AA	0.745
AD	0.244

The first PCA component accounted for 21.98% of the kinematic variability in the stimuli set and successfully distinguished between chosen and directed reaches. Inspection of this component loadings shows positive weights (≥0.3) for movement time, total time, side-selection angle, vertical area under the curve (v-AUC), and ascending angle. No negative loadings were relevant (≤ −0.3). IT, initiation time; MT, movement time; TT, total time. Other abbreviations are as in Table S1.