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Study design
| Week | Monday | Tuesday | Wednesday | Thursday | Friday | |
|---|---|---|---|---|---|---|
| 1 | MA (mg/70 kg) | S (50) | C (50) | Off | S (12) | C (12) |
| 2 | AMPH (mg/70 kg) | S (12) | C (12) | Off | S (50) | C (50) |
| 3 | S (placebo) | C (placebo) |
Note: Sample administration and Choice procedure occurred at 1000 h.
MA=methamphetamine; AMPH=d-amphetamine. S=sample session; C=choice session. All participants completed five 2-day blocks of sessions, one for each dosing condition. Dosing order was varied across participants.
