Table 2.

Descriptive statistics for delayed response (DR), delayed nonmatching-to-sample (DNMS), and object discrimination (OD) tasks. Mean and standard deviation (std) for each species and age group are provided for learning data (trials to criterion) and performance data across delays (percent correct). NA indicates that delay in seconds is not applicable to the OD task.

Task	Data type	Delay (seconds)	Statistic	Adult Bonnet	Aged Bonnet	Adult Rhesus	Aged Rhesus
DR	Trials to criterion	1	mean	155	205.71	184	248.33
			std	61.24	105.96	121.82	165.54
	Percent correct	5	mean	87.78	84.31	85.73	83.77
			std	6.53	3	8.41	11
		10	mean	79.17	79.34	81.41	80.09
			std	6.43	6.74	10.2	12.54
		15	mean	78.97	73.09	79.18	75.45
			std	12.26	14.72	11.66	14.61
		30	mean	74.67	67.63	68.03	67.01
			std	11.24	12.24	13.47	9.97
		60	mean	70.65	69.94	60.99	54.72
			std	8.08	7.23	13.96	5.69
DNMS	Trials to criterion	10	mean	313.33	571.43	241.43	1048.42
			std	234.83	385.55	126.54	409.9
	Percent correct	15	mean	86.67	87.14	92.53	88.26
			std	5.54	4.56	3.2	3.5
		30	mean	89.67	86.14	88.51	85.51
			std	2.66	4.26	6.03	4.07
		60	mean	86.33	85.83	86.7	82.78
			std	3.27	5.05	5.76	5.95
		120	mean	77.33	83.71	83.39	78.83
			std	7.71	2.98	6.89	5.41
		600	mean	71.83	60.29	76.13	65.43
			std	26.2	31.73	10.76	8.06
OD	Trials to criterion	NA	mean	5.96	7.35	9.32	13.48
			std	2.09	1.58	4.94	4.85
	Percent correct	NA – 48 hours later	mean	92.19	88.09	90.57	85.98
			std	3.2	2.61	7.02	4.72