Table 1.

Mean proportions and SEs for each dependent measure across age, transfer type, and context.

Measures
		Gesture proportion		Action fidelity		Goal proportion		Goal efficiency
Transfer type	Context	2.0 years	2.5 years	2.0 years	2.5 years	2.0 years	2.5 years	2.0 years	2.5 years
Baseline	None	0.06 (0.03)	0.08 (0.06)	0.07 (0.04)	0.05 (0.03)	0.00 (0.00)	0.00 (0.00)	0.00 (0.00)	0.00 (0.00)
	Ocean	0.00 (0.00)	0.14 (0.06)	0.00 (0.00)	0.11 (0.06)	0.00 (0.00)	0.04 (0.04)	0.00 (0.00)	0.03 (0.03)
Video	None	0.24 (0.11)	0.12 (0.06)	0.11 (0.06)	0.05 (0.03)	0.23 (0.12)	0.39 (0.13)	0.16 (0.10)	0.25 (0.10)
	Ocean	0.19 (0.08)	0.25 (0.09)	0.08 (0.04)	0.10 (0.05)	0.32 (0.12)	0.42 (0.15)	0.22 (0.09)	0.36 (0.13)
Live	None	0.40 (0.09)	0.28 (0.08)	0.24 (0.07)	0.24 (0.07)	0.24 (0.09)	0.81 (0.09)	0.11 (0.05)	0.42 (0.08)
	Ocean	0.45 (0.09)	0.31 (0.10)	0.36 (0.08)	0.12 (0.04)	0.61 (0.12)	0.57 (0.13)	0.25 (0.06)	0.24 (0.06)
Measure totals		0.23 (0.04)	0.20 (0.03)	0.15 (0.03)	0.11 (0.02)	0.23 (0.04)	0.38 (0.05)	0.12 (0.03)	0.22 (0.04)