Table 2.

Relearning and retention of delayed nonmatching-to-sample at 2 years of age

Group/case	Sex	Learning		Retention		Percentage correct
		Trials	Errors	Trials	Errors
N
N-1a	Male	220	67	0	0	90
N-2a	Male	180	51	0	0	97
N-3a	Female	160	47	0	0	90
N-4a	Female	120	46	0	0	96
N-5	Female	240	52	0	0	94
N-6	Female	180	56	0	0	95
	M	183.3	53.17	0	0	93.7
IC
Neo-IC-1a	Female	180	66	0	0	99
Neo-IC-2a	Male	200	55	0	0	95
Neo-IC-3a	Female	320	96	40	13	90
Neo-IC-4a	Male	500	120	80	14	91
	M	300	84.5	30	6.75	93.8
ICO
Neo-ICO-1	Female	1000	313	640	138	91
Neo-ICO-2	Female	1500	302	-	-	85
Neo-ICO-3	Female	120	24	0	0	92
Neo-ICO-4	Female	1500	387	480	62	90
	M	1280	307.5	373.3	66.7	89.5
O
Neo-O-1	Male	100	32	20	4	90
Neo-O-2	Female	220	55	40	7	90
Neo-O-3	Female	120	32	60	10	90
	M	148	64	40	7	90.0

Note: Scores are the number of trials and errors before reaching criterion to learn the DNMS rule and to retain it after a delay of 2 weeks. Percentage correct reflects the performance during the 5-day criterion trials. M, mean; numbers in italics represent mean values for each group.

^aAnimals that were reported in Málková et al. (2000). Note that Case O-4 was not tested at 2 years.