# Visual Surround Suppression and Perceptual Expectation Under Psilocybin

> **NCT04424225** · PHASE1 · TERMINATED · sponsor: **University of Minnesota** · enrollment: 10 (actual)

## Conditions studied

- Perception Disturbance
- Visual Suppression
- Psychedelic Experiences

## Interventions

- **DRUG:** Psilocybin
- **DRUG:** Niacin

## Key facts

- **NCT ID:** NCT04424225
- **Lead sponsor:** University of Minnesota
- **Sponsor class:** OTHER
- **Phase:** PHASE1
- **Study type:** INTERVENTIONAL
- **Status:** TERMINATED
- **Start date:** 2021-08-30
- **Primary completion:** 2023-09-01
- **Final completion:** 2023-09-01
- **Target enrollment:** 10 (ACTUAL)
- **Why stopped:** Could not secure additional funding to continue the study. Pilot phase of study completed.
- **Last updated:** 2025-06-27

## Collaborators

- [object Object]

## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT04424225

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT04424225, "Visual Surround Suppression and Perceptual Expectation Under Psilocybin". Retrieved via AI Analytics 2026-05-25 from https://api.ai-analytics.org/clinical/NCT04424225. Licensed CC0.

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