Brain mechanisms of hallucinogens and entactogens.

"The author would like to thank M. F. I. Vollenweider-Scherpenhuyzen, MD, for critical comments on the manuscript; the subjects who participated in these studies; his collaborators from the University of California San Diego (Mark A. Geyer, PhD, Martin Paulus, MD), the University of Groningen (K. L. Leenders, MD), and the PET Center University of Zurich (Alfred Buck, MD); and David E. Nichols, PhD for reading the manuscript and providing chemical structure drawings. Some of the work summarized here was supported by the Swiss National Science Foundation (SNF 32-040900, 32-53001.97, and 31-52989.97), the Swiss Federal Office of Health (BAG: 316.98.0686 and 316.98.0724), and the Heffter Research Institute, USA (Grant HRI-02.99).: The author would like to dedicate this article to Dr Albert Hofmann on the occasion of his 95th birthday."