Table 1.

Locomotor activity (mean photobeam breaks ± SEM) during conditioning trials for Experiment 2.

	Adolescent AMPH	Adolescent Saline	Adult AMPH	Adult Saline
Conditioning Trial 1	26.8 (± 2.3)#	20.7 (± 1.4)	20.6 (± 1.0)	20.7 (± 2.2)
Conditioning Trial 2	27.7 (± 2.1)*	20.2 (± 1.7)	24.1 (± 1.0)*	19.1 (±2.0)
Conditioning Trial 3	28.2 (± 2.2)*	19.8 (± 1.6)	28.4 (± 1.4)*	18.3 (± 1.3)
Conditioning Trial 4	30.5 (± 2.9)*	18.1 (± 1.6)	29.8 (± 1.4)*	19.76 (± 1.6)

^*p < .05, relative to saline.

^#p < .05, relative to adults treated with AMPH.

Note: data from the individually- and pair-housed animals have been combined into one group.