1 Centre for Psychedelic Research, Faculty of Medicine, Imperial College London, London, United Kingdom.
2 Pharmaco-Neuroimaging and Cognitive-Emotional Processing, Department of Psychiatry, Psychotherapy and Psychosomatics, Psychiatric Hospital, University of Zurich, Zürich, Switzerland.
3 Independent Researcher, Cleveland, OH, United States.
4 Retired, School of Human Evolution and Social Change, Arizona State University, Tempe, AZ, United States.