Drug Effects Questionnaire
Subjects completed several standardized questionnaires, but here we report only on the Drug Effects Questionnaire (DEQ), which consisted of three visual analog scale items (a 100-mm line) on which subjects rated how much they felt a drug effect, liked the drug, and wanted more of the drug. For each question, an area under the curve (AUC) was calculated separately for 5, 10, and 20 mg d-amphetamine and subtracted from the placebo AUC to create an index of drug effects net placebo responding. It should be noted that these items are based on a simple visual analog scale, and because the participants were not drug users, it should not be considered a measure of drug “craving”.