Table 3.

Summary of significant age, species, and delay effects and interactions for initial acquisition and performance across delays of each behavioral task.

	DR	DNMS	OD
	Spatial short-term memory	Object recognition memory	Object-reward association memory
Acquisition	- No significant effects	Age*species - Age	- Species - Age
Trials to reach criterion		Aged macaques were slower than adults, and aged rhesus macaques were especially impaired	Rhesus macaques were slower than bonnet macaques and aged macaques were slower than adult macaques
Performance across delays	- Species*delay - Delay	- Age*delay - Delay	- Age
Percent correct	Rhesus macaques scored worse than did bonnet macaques, especially at longer delays	Aged macaques scored worse than did adults, especially at longer delays	Aged macaques scored worse than did adults