Table 2.

Mean of the SQRT transformed avoidance responses per minute of the d-amphetamine group and morphine group during the baseline session prior to revaluation

Drug	Treatment condition	Mean	SE
d-amphetamine	Paired	2.8	0.2
	Unpaired	2.9	0.2
Morphine	Paired	2.4	0.2
	Unpaired	2.5	0.2