Infant

Uninformed

Adult

Informed

Adult

Demonstration duration (s)*

16.90 (0.90)

14.70 (0.82)

14.45 (0.88)

Reach-to-grasp phase

Phase duration (s)

1.02 (0.03)

1.01 (0.04)

0.99 (0.02)

Mean wrist velocity (mm/s)

308.33 (9.26)

319.18 (12.38)

309.59 (8.83)

Wrist trajectory (mm)

310.89 (8.03)

314.27 (11.91)

301.08 (9.18)

Peak height of wrist (mm)

99.20 (5.74)

101.31 (9.93)

90.55 (6.47)

Peak grip aperture (mm)*

86.50 (1.60)

84.06 (1.60)

85.61 (1.71)

Lift-to-place phase

Phase duration (s)*

1.67 (0.17)

1.33 (0.14)

1.30 (0.15)

Mean wrist velocity (mm/s)*

368.33 (30.49)

412.28 (32.15)

411.60 (29.78)

Wrist trajectory (mm)*

522.36 (20.73)

484.13 (26.46)

471.53 (23.17)

Peak height of wrist (mm)*

287.60 (9.62)

270.23 (8.31)

260.05 (8.68)