Rostral Anterior Cingulate Thickness Predicts the Emotional Psilocybin Experience
Candace R. Lewis, Katrin H. Preller, B. Blair Braden, Cory Riecken, Franz X. Vollenweider
Biomedicines February 18, 2020 DOI: 10.3390/biomedicines8020034 (opens in new tab)
Study at a glance
AI-extracted from the abstract| Characteristics | Observational cohort Peer reviewed |
|---|---|
| Sample size | 55 |
| Population | Healthy adults |
| Intervention | Psilocybin |
| Dose | 0.160 mg/kg or 0.215 mg/kg |
| Topics | Psilocybin Serotonin |
| Keywords | Anterior cingulate cortex Hallucinogen 5-HT Receptor Posterior cingulate Cognition Audiology |
| Citations | 27 |
| Key findings | Greater rostral anterior cingulate thickness predicted higher emotional sub-scale ratings on the 5D-ASC after psilocybin administration. |
Abstract
Psilocybin is the psychoactive compound of mushrooms in the psilocybe species. Psilocybin directly affects a number of serotonin receptors, with highest affinity for the serotonin 2A receptor (5HT-2Ar). Generally, the effects of psilocybin, and its active metabolite psilocin, are well established and include a range of cognitive, emotional, and perceptual perturbations. Despite the generality of these effects, there is a high degree of inter-individual variability in subjective psilocybin experiences that are not well understood. Others have shown brain morphology metrics derived from magnetic resonance imaging (MRI) can predict individual drug response. Due to high expression of serotonin 2A receptors (5HT-2Ar) in the cingulate cortex, and its prior associations with psilocybin, we investigate if cortical thickness of this structure predicts the psilocybin experience in healthy adults. We hypothesized that greater cingulate thickness would predict higher subjective ratings in sub-scales of the Five-Dimensional Altered State of Consciousness (5D-ASC) with high emotionality in healthy participants (n = 55) who received oral psilocybin (either low dose: 0.160 mg/kg or high dose: 0.215 mg/kg). After controlling for sex, age, and using false discovery rate (FDR) correction, we found the rostral anterior cingulate predicted all four emotional sub-scales, whereas the caudal and posterior cingulate did not. How classic psychedelic compounds induce such large inter-individual variability in subjective states has been a long-standing question in serotonergic research. These results extend the traditional set and setting hypothesis of the psychedelic experience to include brain structure metrics.
Comparable studies
Other observational and cohort studies on psilocybin, most cited first.
| Study | Year | Design | Participants |
|---|---|---|---|
| Psilocybin for treatment-resistant depression: fMRI-measured brain mechanisms. Patients with treatment-resistant depression | 2017 | Observational cohort | n = 19 |
| Psychedelic effects of psilocybin correlate with serotonin 2A receptor occupancy and plasma psilocin levels Healthy volunteers | 2019 | Observational cohort | n = 8 |
| Increased spontaneous MEG signal diversity for psychoactive doses of ketamine, LSD and psilocybin Humans | 2017 | Observational study | |
| Classic psychedelic use is associated with reduced psychological distress and suicidality in the United States adult population. USA adult respondents from the National Survey on Drug Use and Health (2008-2012) | 2015 | Observational cohort | n = 190,000 |
| Prediction of Psilocybin Response in Healthy Volunteers Healthy volunteers | 2012 | Observational cohort | n = 409 |
Citations in the library
Cited by 24
- Predicting Reactions to Psychedelic Drugs: A Systematic Review of States and Traits Related to Acute Drug Effects. ACS Pharmacology & Translational Science March 5, 2021
- Psychedelics in Psychiatry: Neuroplastic, Immunomodulatory, and Neurotransmitter Mechanisms Pharmacological Reviews December 16, 2020
- Dose–response relationships of psilocybin-induced subjective experiences in humans Journal of Psychopharmacology March 4, 2021
- Neural Mechanisms and Psychology of Psychedelic Ego Dissolution Pharmacological Reviews September 9, 2022
- Psychedelic Therapy's Transdiagnostic Effects: A Research Domain Criteria (RDoC) Perspective Frontiers in Psychiatry December 17, 2021
and 19 more in the library
Cites 34
- Psilocybin produces substantial and sustained decreases in depression and anxiety in patients with life-threatening cancer: A randomized double-blind trial Journal of Psychopharmacology November 30, 2016
- Rapid and sustained symptom reduction following psilocybin treatment for anxiety and depression in patients with life-threatening cancer: a randomized controlled trial Journal of Psychopharmacology November 30, 2016
- Psilocybin can occasion mystical-type experiences having substantial and sustained personal meaning and spiritual significance Psychopharmacology July 7, 2006
- Psilocybin with psychological support for treatment-resistant depression: an open-label feasibility study. The Lancet Psychiatry May 17, 2016
- Psilocybin-assisted treatment for alcohol dependence: A proof-of-concept study Journal of Psychopharmacology January 13, 2015
and 29 more in the library