TABLE 2.

Effects of MA, d-amphetamine, COC, methylphenidate, and GBR 12909 on mean latency to complete a trial and rates of responding as a percentage of control values under the discrete-trial avoidance/escape procedure and the food presentation procedure

Data are means ± S.E.M.

Drug	Dose	Mean Latency	Dose	Response Rate
	mg/kg	s	mg/kg	responses/min
Vehicle		11.48 (±1.81)		94.94 (±3.13)
MA	1.0	7.30 (±1.57)	0.3	108.20 (±12.14)
d-Amphetamine	3.0	15.11 (±6.26)	1.0	84.94 (±19.57)
COC	18	8.16 (±1.66)	18	59.23 (±13.47)
Methylphenidate	10	14.31 (±7.44)	3.0	104.02 (±17.37)
GBR 12909	30	13.37 (±7.37)	18	101.17 (±17.48)