Table 2.

Performance scores

Monkey	Delayed nonmatching to sample					Visual paired-comparison
	8 sec	15 sec	1 min	10 min	40 min	1 sec	10 sec	1 min	10 min
N1	94	99	96	86	74	61	61	62	57
N2	95	95	91	68	76	66	57	67	60
N3	92	92	91	85	78	67	65	63	60
N4	92	92	92	85	78	63	67	65	66
N5	92	94	90	73	67	67	63	63	65
Mean	93	94	92	79	75	65	63	64	62
ISC1	92	92	92	69	−	Not tested
ISC2	92	89	86	57	−
ISC3	91	88	88	61	−
ISC4	92	82	76	70	−
Mean	92	88	86	64
RF1-1	92	94	90	71	62
RF1-2	90	94	90	63	61	Not tested
RF1-3	92	96	92	76	68
RF1-4	92	94	88	64	56
Mean	92	95	90	69	62
RF2-1	91	94	88	66	53	70	55	60	53
RF2-2	94	93	88	66	57	61	49	58	58
RF2-3	91	92	86	57	52	61	62	59	59
RF2-4	91	90	80	66	63	61	55	58	51
RF2-5	92	89	90	74	79	73	64	56	52
Mean	92	92	86	66	61	65	57	58	55
IBO1-1	92	90	90	70	66
IBO1-2	94	86	88	60	58
IBO1-3	94	89	88	73	59	Not tested
IBO1-4	94	94	90	73	67
IBO1-5	91	88	89	68	63
Mean	93	89	89	69	63
IBO2-1						65	54	54	55
IBO2-2						57	53	45	55
IBO2-3	Not tested					70	51	54	55
IBO2-4						64	59	67	55
Mean						64	54	55	55

For the delayed nonmatching to sample task, the delay scores are the percentage of correct scores for each delay averaged across the two administrations of the task. The ISC group was not tested on the 40 min delay. The scores for the visual paired-comparison task are the percentage of total time that the animal viewed the novel stimulus at each delay. N, Unoperated control monkeys; other abbreviations are as in Table 1.