Table 2 Estimated posterior distributions for best-fitting model of each condition presented in Table 1.

Coefficients represent predicted total time spent looking toward the speaker after FS/GS, and VS relative to FS/GS.

Species	Condition	Parameter	Mean	SD	5.5% CI	94.5% CI
Marmosets	Nonadjacent	FS/GS	0.29	0.15	0.07	0.53
		VS	0.61	0.28	0.17	1.03
Marmosets	Adjacent	FS/GS	0.30	0.16	0.03	0.52
		VS	0.79	0.38	0.16	1.38
Chimpanzees	Non-adjacent	FS/GS	0.49	0.28	0.01	0.88
		VS	1.54	1.09	−0.19	3.20
Chimpanzees	Adjacent	FS/GS	1.28	0.67	0.20	2.25
		VS	1.27	0.85	0.02	2.60