Table 2.

Drug effects on trial omissions and response latencies. Mean (± SEM) values are shown.

	Ascending Delays Task		Descending Delays Task
Drug, dose (mg/kg)	Omissions	Lever press latencies (sec)	Omissions	Lever press latencies (sec)
Yohimbine
Vehicle	4.6(1.2)	2.1(0.1)	8.6(1.6)	2.5 (0.1)
0.6	3.2 (0.8)	1.9 (0.1)	4.2 (0.7)	1.9(0.1)***
1.25	2.3 (0.8)	1.7(0.1)*	4.3 (0.7)	2.0(0.1)*
2.5	1.7(0.7)*	1.9 (0.2)	6.1(1.3)	2.3 (0.2)
5	4.5(1.0)	2.3(0.2)	12.9 (2.5)	3.0 (0.3)
Propranolol
Vehicle	2.9 (0.8)	1.7(0.1)	10.8(1.6)	2.5 (0.2)
1	2.7(0.7)	1.7(0.2)	12.0(2.2)	2.7 (0.2)
3	2.7(0.5)	1.8(0.1)	9.6(1.9)	2.6 (0.3)
10	5.0(1.3)	2.0(0.2)	15.2(3.5)	2.7 (0.3)
Prazosin
Vehicle	4.1(1.2)	1.9 (0.2)	10.2(1.7)	2.4 (0.1)
0.5	6.1(1.0)	2.1(0.1)
1	7.6(2.1)	2.1(0.2)
2	7.7(1.8)	2.3(0.1)	15.0(3.3)	3.1(0.3)*
Guanfacine
Vehicle	4.1(0.9)	1.8(0.1)	11.1(2.9)	2.4 (0.2)
0.06	6.0(1.6)	2.1(0.2)
0.125	11.1(3.5)	2.7 (0.2)*	12.8(3.2)	2.8 (0.2)
0.25	21.2(6.0)*	3.2(0.4)***

Asterisks indicate significance relative to vehicle:

^*p < 0.05,

^***p < 0.001