Self-Report Measures.
  1. The Drug Effects Questionnaire (DEQ; Morean et al., 2013) The DEQ consists of 100 point visual analog scales (VAS) describing responses to the drug. Here we focused only on the questions “Do you like the effects that you are feeling now?” (“Not at all” (0) to “Very much” (100)) and “Would you like more of what you consumed, right now?” (“Not at all” (0) to “Very much” (100)).
  2. Visual Analogue Scales (VAS) . The VAS consisted of 14 words describing drug-like experiences. Here we present data from the words “Sociable” and “Friendly”. Participants rated on a 100-point scale how strongly they felt those feelings (‘not at all’ to ‘extremely’) at each of the five time points during each session.
  3. The Session End Questionnaire (SEQ). The SEQ consists of questions relating to the drug received during the session. Participants indicated how pleasant they found the experience (from ‘dislike’ (0) to ‘like very much’ (100)) and what they thought they had received (i.e., Valium, Ketamine, Amphetamine, MDMA, LSD, Placebo).