Denis Pavăl, MD, PhD, is a psychiatrist and faculty member at the “Iuliu Hațieganu” University of Medicine and Pharmacy, Cluj-Napoca, where he combines academic teaching with active clinical practice. His research is firmly grounded in neuroscience, with a particular emphasis on the biological mechanisms underlying major psychiatric disorders. Dr. Pavăl has an extensive publication record in internationally indexed journals and contributes regularly to leading neuropsychiatric conferences. His scholarly interests also extend to the neuroscience of religion, where he examines how brain processes inform spiritual experience and the development of belief systems.

• Chapter 1. Introduction.- Chapter 2. The phenomenology of psychedelic experiences.- Chapter 3. The phenomenology of psychedelic experiences.- Chapter 4. Evidence of historical psychedelic use in religious practices.- Chapter 5. Conclusion.