Induction and Extinction of Psilocybin Induced Transformations of Visual Space
Richard M. Hill, Roland Fischer
Pharmacopsychiatry 1973 DOI: 10.1055/s-0028-1094389 (opens in new tab)
Study at a glance
AI-extracted from the abstract| Characteristics | Experimental study Peer reviewed |
|---|---|
| Sample size | 16 |
| Population | College-age volunteers |
| Intervention | Psilocybin |
| Dose | 160 µg/kg |
| Topics | Psilocybin |
| Keywords | Extinction optical mineralogy Space punctuation Hallucinogen Cognitive psychology Optics |
| Citations | 8 |
| Key findings | Psilocybin accentuates the natural misjudgment of the visual vertical, and this effect is further augmented after exposure to strong body distortion. |
Abstract
There is a “natural” tendency to misjudge the position of the visual as compared to the gravitational vertical. A 160 µg/kg psilocybin-induced accentuation of this misjudgment in 16 college-age volunteers, and a further augmentation in their accentuated drug response after exposure to strong body distortion is reported.
Comparable studies
Other experimental studies on psilocybin, most cited first.
| Study | Year | Design | Participants |
|---|---|---|---|
| Psilocybin induces schizophrenia-like psychosis in humans via a serotonin-2 agonist action Healthy human volunteers | 1998 | Experimental study | |
| Validation of the revised Mystical Experience Questionnaire in experimental sessions with psilocybin Participants in controlled laboratory experiments receiving a moderate to high oral... | 2015 | Validation study using pooled data from five laboratory experiments | n = 184 |
| Broadband Cortical Desynchronization Underlies the Human Psychedelic State Healthy human participants | 2013 | Experimental study | |
| Long-term follow-up of psilocybin-assisted psychotherapy for psychiatric and existential distress in patients with life-threatening cancer Participants with cancer-related psychiatric distress who completed a parent randomized... | 2020 | Long-term within-subjects follow-up analysis | n = 15 |
| Enzymatic Synthesis of Psilocybin | 2017 | Laboratory study |
Citations in the library
Cited by 6
- Occurrence and use of hallucinogenic mushrooms containing psilocybin alkaloids TemaNord May 19, 2009
- Hyperbolic: Divining Ayahuasca Discourse December 1, 2005
- Preliminary validation and refinement of the psychedelic aesthetic experience questionnaire Frontiers in Psychology September 15, 2025
- Neuroaesthetics of the Psychedelic State. Neuropsychologia July 26, 2025
- Serotonergic Hallucinogen-Induced Visual Perceptual Alterations. Current Topics in Behavioral Neurosciences 2018
and 1 more in the library