Table 1.

Learning and retention of delayed nonmatching-to-sample at 3 months of age

Group/case	Sex	Learning		Retention		Percentage correct
		Trials	Errors	Trials	Errors
N
N-1a	Male	720	202	0	0	91
N-2a	Male	460	145	80	15	91
N-3a	Female	320	115	80	14	90
N-4a	Female	320	109	80	15	90
N-5	Female	660	116	60	23	91
N-6	Female	1080	300	20	4	90
	M	593	165	53.3	11.83	90.5
IC
Neo-IC-1a	Female	560	108	40	7	92
Neo-IC-2a	Male	760	228	0	0	90
Neo-IC-3a	Female	440	157	40	8	93
Neo-IC-4a	Male	340	127	0	0	90
	M	525	143.3	20	3.75	91.3
ICO
Neo-ICO-1	Female	840	319	200	46	90
Neo-ICO-2	Female	800	223	180	40	90
Neo-ICO-3	Female	980	343	180	24	91
Neo-ICO-4	Female	680	218	80	14	90
	M	825	275.8	160	31	90.3
O
Neo-O-1	Male	1436	465	0	0	90
Neo-O-2	Female	1100	317	140	25	90
Neo-O-3	Female	1120	640	640	193	90
Neo-O-4	Male	620	182	1160	226	90
	M	1069	401	485	111	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 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).