Figure 4.

Pharmacological manipulation of choice behavior on the control task. (a) Amphetamine decreased choice of lower-probability/HR trials for all animals on the yoked control task, where effort costs were removed (dose: p=0.034; saline vs 1.0 mg/kg: p=0.040). (b) Ethanol caused a modest decrease in the choice of HR trials when all control animals were considered together (dose: p=0.052; saline vs 1.0 g/kg: p=0.010). (c) Caffeine had no effects on choice in the control task. Data are shown as the mean percent choice for each option (±SEM).