Table 1.

Number of sessions completed by individual Lewis and F344 rats at each delay. Also included are area under the choice curve (AUC), and average percent choice of the larger–later (LL) reinforcer.

Rat	AUC	Delay	Sessions	%LL (SEM)	Rat	AUC	Delay	Sessions	%LL (SEM)
L1	991.1	0	25	98.8 (0.8)	F1	1184.0	0	26	97.0 (1.4)
		5	23	96.4 (1.4)			5	29	85.0 (3.7)
		10	49	51.8 (4.4)			10	38	69.3 (5.7)
		15	23	1.2 (0.8)			15	72	67.9 (2.7)
L2	852.3	0	23	100.0 (0.0)	F2	1087.0	0	22	100.0 (0.0)
		5	41	91.1 (2.7)			5	38	98.8 (0.8)
		10	47	24.3 (4.5)			10	31	50.1 (10.2)
		15	32	10.1 (2.8)			15	74	36.9 (7.8)
L3	829.0	0	30	97.6 (1.0)	F3	1073.0	0	50	98.2 (0.9)
		5	33	94.1 (1.5)			5	36	80.9 (3.7)
		10	46	20.2 (5.7)			10	33	59.4 (5.1)
		15	27	5.4 (1.3)			15	43	50.4 (4.6)
L4	771.8	0	25	95.2 (1.6)	F4	1045.0	0	21	98.8 (0.8)
		5	34	83.9 (3.1)			5	31	94.8 (2.0)
		10	42	18.4 (3.5)			10	38	63.8 (4.3)
		15	24	8.9 (2.3)			15	20	1.8 (1.3)
L5	-	0	27	99.4 (0.6)	F5	931.3	0	21	95.8 (1.1)
		5	34	98.8 (0.8)			5	45	87.5 (2.3)
		10	23	3.6 (1.9)			10	50	47.6 (3.9)
		15	-	-			15	42	6.5 (2.7)
L6	723.0	0	24	98.8 (0.8)	F6	875.8	0	26	97.8 (1.3)
		5	58	85.1 (2.7)			5	37	85.1 (4.7)
		10	54	9.5 (2.8)			10	27	32.9 (9.2)
		15	26	1.2 (0.8)			15	77	16.7 (3.6)
L7	708.5	0	27	98.8 (0.8)	F7	861.5	0	24	99.4 (0.6)
		5	43	91.1 (3.1)			5	28	94.0 (1.2)
		10	20	1.2 (0.8)			10	56	26.8 (7.3)
		15	26	0.0 (0.0)			15	35	3.6 (1.1)
L8	473.0	0	22	100 (0.0)	F8	858.3	0	21	98.8 (0.8)
		5	38	42.9 (13.0)			5	39	95.8 (1.4)
		10	20	1.4 (0.9)			10	39	20.8 (3.9)
		15	25	0.6 (0.6)			15	44	11.3 (3.8)
L9	378.0	0	26	97.6 (1.0)	F9	852.5	0	20	98.8 (0.8)
		5	41	14.9 (2.2)			5	74	93.3 (2.4)
		10	22	11.9 (1.8)			10	44	26.9 (7.1)
		15	26	0.0 (0.0)			15	32	1.8 (1.3)
L10	315.5	0	27	95.8 (1.4)	F10	692.3	0	26	95.8 (1.6)
		5	43	14.3 (2.9)			5	24	76.0 (5.7)
		10	20	0.6 (0.6)			10	40	11.3 (2.8)
		15	23	0.6 (0.6)			15	25	6.5 (2.0)