Validating and creating a short-form of the persisting effects questionnaire: A measure of positive and negative outcomes from psychedelic experiences.
BACKGROUND The persisting effects questionnaire (PEQ) is a measure of self-reported positive and negative effects from psychedelic and other experiences. While this measure has been used in many studies on psychedelic substances, the scale has not been formally validated. The PEQ consists of over 140 items as well as s...