Outcomes
SYNDROME, POSITIVE, DRUG EFFECT
The registered primary outcome variables were (i) strength of the subjective drug effect, as measured by self‐reported ‘feel drug effect’ [The subjective ‘feel drug effect’ visual analogue scale (VAS) is a single‐item scale rated from 0 (not at all) to 10 (extremely). The prose recall task requires participants to listen to a 30‐s story presented via headphones, immediately write down as much as they can remember, and then again write down as much as they can remember 100 min later. The PSI is a 48‐item self‐report questionnaire assessing psychotic‐like symptoms.Secondary variables were (i) psychotomimetic effect, as measured by the Positive and Negative Syndrome Scale (PANSS) positive and negative subscales [