Table 1.

Earned Infusions Over the Entire Experiment (52 Sessions) for Each Group

Group	Mean infusions	SE infusions	Range infusions
Constant	725.75	60.89	489–997
Gradual	653.92	72.46	182–1206
15	805.85	195.17	330–1353
7.5	640.83	207.82	114–1456
3.75*	322.44	52.53	155–329
1.875*	212.00	31.20	125–323
Vehicle*	266.78	81.99	111–910

Note. *The 3.75 (t ₁₅ = 5.043, p < .0001), 1.875 (t ₁₃ = 7.180, p < .001), and vehicle (t ₁₅ = 4.399, p < .001) reduction groups all earned significantly less infusions than the constant group. The 1.875 group earned significantly less infusions than the gradual reduction group, (t ₁₇ = 4.472, p < .001).