Table 2: Factors influencing performance in the multiple locations task (Study 2).

Predictors from the full (best-fit) linear mixed model examining number of test versus control pieces located in Study 2. All models included species, age cohort, and subject (as a random factor); location (test versus control) and a species X cohort X location interaction were then added to successive models to test their importance as predictors. Reference values for predictors are indicated in the table.

Factor	Estimate	S.E.	t	P
Species (Bonobo reference)	0.190	0.304	0.626	> 0.53
Cohort (Infant reference)	0.105	0.310	0.339	> 0.73
Location Type (Control reference)	1.077	0.303	3.554	< 0.001
Species X Cohort	0.004	0.411	0.010	> 0.99
Species X Location Type	−0.696	0.386	−1.805	= 0.075
Cohort X Location Type	−0.551	0.393	−1.400	> 0.16
Species X Cohort X Location Type	1.920	0.521	3.686	< 0.001