Table 2.

Mean (±SEM) non-reinforced responses during the terminal link following administration of each psychostimulant drug.

Amphetamine
Dose	0 OA	3 OA	7 OA	15 OA#	31 OA#
0 mg/kg	0.502 (0.002)	0.500 (0.000)	0.500 (0.000)	0.494 (0.006)	0.500 (0.003)
0.25 mg/kg	0.518 (0.011)	0.500 (0.000)	0.484 (0.011)	0.498 (0.002)	0.488 (0.012)
0.5 mg/kg	0.531 (0.027)	0.522 (0.018)	0.494 (0.023)	0.453 (0.025)	0.451 (0.023)
1.0 mg/kg	0.517 (0.016)	0.545 (0.035)	0.513 (0.045)	0.457 (0.045)	0.457 (0.038)
Methylphenidate
Dose	0 OA	3 OA	7 OA	15 OA#	31 OA#
0 mg/kg	0.514 (0.010)	0.500 (0.000)	0.500 (0.000)	0.496 (0.004)	0.476 (0.014)
0.3 mg/kg	0.520 (0.011)	0.500 (0.000)	0.507 (0.007)	0.496 (0.004)	0.485 (0.013)
1.0 mg/kg	0.516 (0.011)	0.535 (0.024)	0.525 (0.028)	0.473 (0.016)	0.459 (0.022)
3.0 mg/kg*	0.495 (0.008)	0.502 (0.002)	0.456 (0.028)	0.441 (0.034)	0.424 (0.031)
Methamphetamine
Dose	0 OA	3 OA	7 OA	15 OA	31 OA
0 mg/kg	0.506 (0.003)	0.500 (0.000)	0.500 (0.000)	0.500 (0.000)	0.496 (0.004)
0.5 mg/kg	0.519 (0.013)	0.509 (0.009)	0.493 (0.016)	0.476 (0.033)	0.475 (0.041)
1.0 mg/kg	0.558 (0.031)	0.523 (0.016)	0.523 (0.031)	0.486 (0.036)	0.513 (0.018)
2.0 mg/kg	0.519 (0.078)	0.538 (0.040)	0.491 (0.032)	0.467 (0.032)	0.510 (0.031)

^*p < .05, relative to vehicle (main effect of dose).

^#p < relative to the 0 OA block (main effect of trial block).