Journal of psychopharmacology (Oxford, England)Sep 18, 2026

Validating and creating a short version of a questionnaire measuring lasting positive and negative effects of psychedelic experiences

Psychedelic Science Weekly Brief ↗PubMed ↗DOI ↗

Updated Sep 19, 2026

Abstract

The persisting effects questionnaire (PEQ) includes over 140 items designed to assess self-reported effects from psychedelic experiences.

The PEQ has been utilized in numerous studies related to psychedelic substances.
There is currently no formal validation of the PEQ scale.
The extensive number of items may contribute to high participant burden.

Simplified

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 several separate single items, causing high participant burden.

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Validating and creating a short version of a questionnaire measuring lasting positive and negative effects of psychedelic experiences

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