Table 1.

Effects of two doses of amphetamine (0.2 and 0.4 mg/kg) on striatal extracellular dopamine levels (nmol/liter) in four Rhesus monkeys

Monkey	Baseline	0.2 mg/kg	% baseline	0.4 mg/kg	% baseline
1	5.9	43.6	+632.2	114.4	+1820.5
2	4.6	51.6	+1006.9	120.0	+2470.7
3	6.6	14.4	+116.5	65.4	+881.3
4	4.5	8.3	+84.1	17.6	+288.5
Mean (±SEM)	5.4  (±0.5)	29.5  (±10.6)	+459.9* (±221.4)	79.3  (±23.9)	+1365.2*  (±485.0)

^*t = 3.3, P = 0.045; % baseline, 0.2 mg/kg vs. % baseline, 0.4 mg/kg.